Home/Code systems/The three letters on the <em>capacitor</em>

Code system

The three letters on the capacitor

On British equipment the most precise date in the machine is often not on the chassis at all: it is three letters printed on a Hunts capacitor, and it gives a week and a year.

Hunts took the key word WHITSUNDAY — ten letters, none of them repeated — and mapped them onto the digits: W=1, H=2, I=3, T=4, S=5, U=6, N=7, D=8, A=9, Y=0. In the normal order the first two letters are the week of the year and the third letter is the last digit of the year.

A reverse order also occurs, with the year letter first, so both readings have to be tried: YIW is week 03 of 1961, while ITD has to be read as year 3, week 48. Every decoded sample in surviving amplifiers falls between 1961 and 1968, and the alphabet repeats each decade.

That last point is what keeps the code honest: the letters give a week and a year digit, and the century has to come from the amplifier's own era. On a Leak Stereo 20 the answer is unambiguous; on a capacitor found loose in a box, it is not.

The same period left other markings on the parts: Mullard mustard capacitors, TCC codes and the EIA stamps on imported parts. They are read the same way — as witnesses about the part.

How to read it

01 / Find the letters

Three capital letters on the capacitor body, sometimes with a fourth marking that is a batch code rather than a date.

02 / Apply WHITSUNDAY

Week from the first two letters, year digit from the third. If the numbers look wrong, try the reverse order.

03 / Fix the decade

The year digit is 0–9: 1961 is the earliest year these codes are found in surviving equipment.

Traps

This dates the capacitor, not the amplifier. It is a terminus post quem: the unit cannot be older than its newest original part.
A re-capped amplifier is full of newer capacitors: original ones have to be identified before their codes mean anything.
A batch or tolerance marking next to the date letters is not part of the date.

Try it

Tables in the archive

McIntosh Laboratory — Hunts capacitor date code (WHITSUNDAY)

1950s-1969 (Hunts taken over by Erie in the late 1960s, probably 1969) · 25 rows · confidence Medium · Vox AC50 — Hunts capacitor date codes

Dates the CAPACITOR, not the unit: it gives a terminus post quem. the source notes that nobody knows how long new capacitors sat on stockroom shelves, so an estimate is 'just a guess or surmise'. Only valid if the capacitor is original - a recap destroys the evidence. Legibility: bias and cathode bypass caps usually show the code, the big clamped filter cans often hide it.

Code as marked	Meaning	Source
YIW	1961, week 03 — AC50 s/n 1034B: week first (03), year last digit 1 -> 1961	Vox AC50 — Hunts capacitor date codes
WAI	1963, week 19 — same unit 1034B, second cap	Vox AC50 — Hunts capacitor date codes
ITD	1963, week 48 — reverse order (year letter first): 3 48 -> 1963 week 48; the page calls it out as an exception	Vox AC50 — Hunts capacitor date codes
WST	1964, week 15 — AC50 1411 / 1524 / 1678 (x2) - the most common code in large-box AC50s	Vox AC50 — Hunts capacitor date codes
HWT	1964, week 21 — AC50 1411, bias circuit cap	Vox AC50 — Hunts capacitor date codes
HUT	1964, week 26 — AC50 1786 and 1876	Vox AC50 — Hunts capacitor date codes
HNT	1964, week 27 — AC50 1727; probably also the '?NT' codes on 2031 and on an Australian unit	Vox AC50 — Hunts capacitor date codes
HDT	1964, week 28 — AC50 1311 (small-box twin channel), 1727, 1852	Vox AC50 — Hunts capacitor date codes
IYT	1964, week 30 — AC100 s/n 392, spent cathode-bypass caps; the page decodes week 30, year letter T = 1964	www.voxac100.org.uk
IST	1964, week 35 — AC50 1502	Vox AC50 — Hunts capacitor date codes
INT	1964, week 37 — AC50 1852	Vox AC50 — Hunts capacitor date codes
TWT	1964, week 41 — AC50 2644, 3615	Vox AC50 — Hunts capacitor date codes
THT	1964, week 42 — AC50 2620	Vox AC50 — Hunts capacitor date codes
TIT	1964, week 43 — AC50 2069 and two solid-state rectified units	Vox AC50 — Hunts capacitor date codes
TTT	1964, week 44 — AC50 - the page prints '?TT = probably TTT'	Vox AC50 — Hunts capacitor date codes
TST	1964, week 45 — AC50 4282 and an early solid-state rectified unit	Vox AC50 — Hunts capacitor date codes
TDT	1964, week 48 — AC50, solid-state rectified, early	Vox AC50 — Hunts capacitor date codes
TAT	1964, week 49 — AC50 3680 - latest 1964 code recorded	Vox AC50 — Hunts capacitor date codes
YUS	1965, week 06 — AC50 4282	Vox AC50 — Hunts capacitor date codes
YNS	1965, week 07 — AC50 3709 - earliest 1965 code recorded	Vox AC50 — Hunts capacitor date codes
HUS	1965, week 26 — AC100 1367, blue Hunts 16 uF	www.voxac100.org.uk
IUS	1965, week 36 — AC100 1367, preamp filter cap	www.voxac100.org.uk
UYT	1966, week 04 — AC100 1367 and the 1900s-serial AC100s (from no. 1905): 'stocks evidently lasted some time'	www.voxac100.org.uk
D YW	1968, week 01 — printed with a space; year first: 8 01 = first week of 1968	Vox AC50 — Hunts capacitor date codes
SS	1965 — printed '?SS' - the page reads it as 'probably 5th or 15th week of 1965'; ambiguous, first letter unreadable	Vox AC50 — Hunts capacitor date codes

Marantz — Hunts capacitor date code (WHITSUNDAY)

1950s-1969 (Hunts taken over by Erie in the late 1960s, probably 1969) · 25 rows · confidence Medium · Vox AC50 — Hunts capacitor date codes

Code as marked	Meaning	Source
YIW	1961, week 03 — AC50 s/n 1034B: week first (03), year last digit 1 -> 1961	Vox AC50 — Hunts capacitor date codes
WAI	1963, week 19 — same unit 1034B, second cap	Vox AC50 — Hunts capacitor date codes
ITD	1963, week 48 — reverse order (year letter first): 3 48 -> 1963 week 48; the page calls it out as an exception	Vox AC50 — Hunts capacitor date codes
WST	1964, week 15 — AC50 1411 / 1524 / 1678 (x2) - the most common code in large-box AC50s	Vox AC50 — Hunts capacitor date codes
HWT	1964, week 21 — AC50 1411, bias circuit cap	Vox AC50 — Hunts capacitor date codes
HUT	1964, week 26 — AC50 1786 and 1876	Vox AC50 — Hunts capacitor date codes
HNT	1964, week 27 — AC50 1727; probably also the '?NT' codes on 2031 and on an Australian unit	Vox AC50 — Hunts capacitor date codes
HDT	1964, week 28 — AC50 1311 (small-box twin channel), 1727, 1852	Vox AC50 — Hunts capacitor date codes
IYT	1964, week 30 — AC100 s/n 392, spent cathode-bypass caps; the page decodes week 30, year letter T = 1964	www.voxac100.org.uk
IST	1964, week 35 — AC50 1502	Vox AC50 — Hunts capacitor date codes
INT	1964, week 37 — AC50 1852	Vox AC50 — Hunts capacitor date codes
TWT	1964, week 41 — AC50 2644, 3615	Vox AC50 — Hunts capacitor date codes
THT	1964, week 42 — AC50 2620	Vox AC50 — Hunts capacitor date codes
TIT	1964, week 43 — AC50 2069 and two solid-state rectified units	Vox AC50 — Hunts capacitor date codes
TTT	1964, week 44 — AC50 - the page prints '?TT = probably TTT'	Vox AC50 — Hunts capacitor date codes
TST	1964, week 45 — AC50 4282 and an early solid-state rectified unit	Vox AC50 — Hunts capacitor date codes
TDT	1964, week 48 — AC50, solid-state rectified, early	Vox AC50 — Hunts capacitor date codes
TAT	1964, week 49 — AC50 3680 - latest 1964 code recorded	Vox AC50 — Hunts capacitor date codes
YUS	1965, week 06 — AC50 4282	Vox AC50 — Hunts capacitor date codes
YNS	1965, week 07 — AC50 3709 - earliest 1965 code recorded	Vox AC50 — Hunts capacitor date codes
HUS	1965, week 26 — AC100 1367, blue Hunts 16 uF	www.voxac100.org.uk
IUS	1965, week 36 — AC100 1367, preamp filter cap	www.voxac100.org.uk
UYT	1966, week 04 — AC100 1367 and the 1900s-serial AC100s (from no. 1905): 'stocks evidently lasted some time'	www.voxac100.org.uk
D YW	1968, week 01 — printed with a space; year first: 8 01 = first week of 1968	Vox AC50 — Hunts capacitor date codes
SS	1965 — printed '?SS' - the page reads it as 'probably 5th or 15th week of 1965'; ambiguous, first letter unreadable	Vox AC50 — Hunts capacitor date codes

Quad (Acoustical Manufacturing) — Hunts capacitor date code (WHITSUNDAY)

1950s-1969 (Hunts taken over by Erie in the late 1960s, probably 1969) · 25 rows · confidence Medium · Vox AC50 — Hunts capacitor date codes

Code as marked	Meaning	Source
YIW	1961, week 03 — AC50 s/n 1034B: week first (03), year last digit 1 -> 1961	Vox AC50 — Hunts capacitor date codes
WAI	1963, week 19 — same unit 1034B, second cap	Vox AC50 — Hunts capacitor date codes
ITD	1963, week 48 — reverse order (year letter first): 3 48 -> 1963 week 48; the page calls it out as an exception	Vox AC50 — Hunts capacitor date codes
WST	1964, week 15 — AC50 1411 / 1524 / 1678 (x2) - the most common code in large-box AC50s	Vox AC50 — Hunts capacitor date codes
HWT	1964, week 21 — AC50 1411, bias circuit cap	Vox AC50 — Hunts capacitor date codes
HUT	1964, week 26 — AC50 1786 and 1876	Vox AC50 — Hunts capacitor date codes
HNT	1964, week 27 — AC50 1727; probably also the '?NT' codes on 2031 and on an Australian unit	Vox AC50 — Hunts capacitor date codes
HDT	1964, week 28 — AC50 1311 (small-box twin channel), 1727, 1852	Vox AC50 — Hunts capacitor date codes
IYT	1964, week 30 — AC100 s/n 392, spent cathode-bypass caps; the page decodes week 30, year letter T = 1964	www.voxac100.org.uk
IST	1964, week 35 — AC50 1502	Vox AC50 — Hunts capacitor date codes
INT	1964, week 37 — AC50 1852	Vox AC50 — Hunts capacitor date codes
TWT	1964, week 41 — AC50 2644, 3615	Vox AC50 — Hunts capacitor date codes
THT	1964, week 42 — AC50 2620	Vox AC50 — Hunts capacitor date codes
TIT	1964, week 43 — AC50 2069 and two solid-state rectified units	Vox AC50 — Hunts capacitor date codes
TTT	1964, week 44 — AC50 - the page prints '?TT = probably TTT'	Vox AC50 — Hunts capacitor date codes
TST	1964, week 45 — AC50 4282 and an early solid-state rectified unit	Vox AC50 — Hunts capacitor date codes
TDT	1964, week 48 — AC50, solid-state rectified, early	Vox AC50 — Hunts capacitor date codes
TAT	1964, week 49 — AC50 3680 - latest 1964 code recorded	Vox AC50 — Hunts capacitor date codes
YUS	1965, week 06 — AC50 4282	Vox AC50 — Hunts capacitor date codes
YNS	1965, week 07 — AC50 3709 - earliest 1965 code recorded	Vox AC50 — Hunts capacitor date codes
HUS	1965, week 26 — AC100 1367, blue Hunts 16 uF	www.voxac100.org.uk
IUS	1965, week 36 — AC100 1367, preamp filter cap	www.voxac100.org.uk
UYT	1966, week 04 — AC100 1367 and the 1900s-serial AC100s (from no. 1905): 'stocks evidently lasted some time'	www.voxac100.org.uk
D YW	1968, week 01 — printed with a space; year first: 8 01 = first week of 1968	Vox AC50 — Hunts capacitor date codes
SS	1965 — printed '?SS' - the page reads it as 'probably 5th or 15th week of 1965'; ambiguous, first letter unreadable	Vox AC50 — Hunts capacitor date codes

Thorens — Hunts capacitor date code (WHITSUNDAY)

1950s-1969 (Hunts taken over by Erie in the late 1960s, probably 1969) · 25 rows · confidence Medium · Vox AC50 — Hunts capacitor date codes

Code as marked	Meaning	Source
YIW	1961, week 03 — AC50 s/n 1034B: week first (03), year last digit 1 -> 1961	Vox AC50 — Hunts capacitor date codes
WAI	1963, week 19 — same unit 1034B, second cap	Vox AC50 — Hunts capacitor date codes
ITD	1963, week 48 — reverse order (year letter first): 3 48 -> 1963 week 48; the page calls it out as an exception	Vox AC50 — Hunts capacitor date codes
WST	1964, week 15 — AC50 1411 / 1524 / 1678 (x2) - the most common code in large-box AC50s	Vox AC50 — Hunts capacitor date codes
HWT	1964, week 21 — AC50 1411, bias circuit cap	Vox AC50 — Hunts capacitor date codes
HUT	1964, week 26 — AC50 1786 and 1876	Vox AC50 — Hunts capacitor date codes
HNT	1964, week 27 — AC50 1727; probably also the '?NT' codes on 2031 and on an Australian unit	Vox AC50 — Hunts capacitor date codes
HDT	1964, week 28 — AC50 1311 (small-box twin channel), 1727, 1852	Vox AC50 — Hunts capacitor date codes
IYT	1964, week 30 — AC100 s/n 392, spent cathode-bypass caps; the page decodes week 30, year letter T = 1964	www.voxac100.org.uk
IST	1964, week 35 — AC50 1502	Vox AC50 — Hunts capacitor date codes
INT	1964, week 37 — AC50 1852	Vox AC50 — Hunts capacitor date codes
TWT	1964, week 41 — AC50 2644, 3615	Vox AC50 — Hunts capacitor date codes
THT	1964, week 42 — AC50 2620	Vox AC50 — Hunts capacitor date codes
TIT	1964, week 43 — AC50 2069 and two solid-state rectified units	Vox AC50 — Hunts capacitor date codes
TTT	1964, week 44 — AC50 - the page prints '?TT = probably TTT'	Vox AC50 — Hunts capacitor date codes
TST	1964, week 45 — AC50 4282 and an early solid-state rectified unit	Vox AC50 — Hunts capacitor date codes
TDT	1964, week 48 — AC50, solid-state rectified, early	Vox AC50 — Hunts capacitor date codes
TAT	1964, week 49 — AC50 3680 - latest 1964 code recorded	Vox AC50 — Hunts capacitor date codes
YUS	1965, week 06 — AC50 4282	Vox AC50 — Hunts capacitor date codes
YNS	1965, week 07 — AC50 3709 - earliest 1965 code recorded	Vox AC50 — Hunts capacitor date codes
HUS	1965, week 26 — AC100 1367, blue Hunts 16 uF	www.voxac100.org.uk
IUS	1965, week 36 — AC100 1367, preamp filter cap	www.voxac100.org.uk
UYT	1966, week 04 — AC100 1367 and the 1900s-serial AC100s (from no. 1905): 'stocks evidently lasted some time'	www.voxac100.org.uk
D YW	1968, week 01 — printed with a space; year first: 8 01 = first week of 1968	Vox AC50 — Hunts capacitor date codes
SS	1965 — printed '?SS' - the page reads it as 'probably 5th or 15th week of 1965'; ambiguous, first letter unreadable	Vox AC50 — Hunts capacitor date codes

Revox (Willi Studer) — Hunts capacitor date code (WHITSUNDAY)

1950s-1969 (Hunts taken over by Erie in the late 1960s, probably 1969) · 25 rows · confidence Medium · Vox AC50 — Hunts capacitor date codes

Code as marked	Meaning	Source
YIW	1961, week 03 — AC50 s/n 1034B: week first (03), year last digit 1 -> 1961	Vox AC50 — Hunts capacitor date codes
WAI	1963, week 19 — same unit 1034B, second cap	Vox AC50 — Hunts capacitor date codes
ITD	1963, week 48 — reverse order (year letter first): 3 48 -> 1963 week 48; the page calls it out as an exception	Vox AC50 — Hunts capacitor date codes
WST	1964, week 15 — AC50 1411 / 1524 / 1678 (x2) - the most common code in large-box AC50s	Vox AC50 — Hunts capacitor date codes
HWT	1964, week 21 — AC50 1411, bias circuit cap	Vox AC50 — Hunts capacitor date codes
HUT	1964, week 26 — AC50 1786 and 1876	Vox AC50 — Hunts capacitor date codes
HNT	1964, week 27 — AC50 1727; probably also the '?NT' codes on 2031 and on an Australian unit	Vox AC50 — Hunts capacitor date codes
HDT	1964, week 28 — AC50 1311 (small-box twin channel), 1727, 1852	Vox AC50 — Hunts capacitor date codes
IYT	1964, week 30 — AC100 s/n 392, spent cathode-bypass caps; the page decodes week 30, year letter T = 1964	www.voxac100.org.uk
IST	1964, week 35 — AC50 1502	Vox AC50 — Hunts capacitor date codes
INT	1964, week 37 — AC50 1852	Vox AC50 — Hunts capacitor date codes
TWT	1964, week 41 — AC50 2644, 3615	Vox AC50 — Hunts capacitor date codes
THT	1964, week 42 — AC50 2620	Vox AC50 — Hunts capacitor date codes
TIT	1964, week 43 — AC50 2069 and two solid-state rectified units	Vox AC50 — Hunts capacitor date codes
TTT	1964, week 44 — AC50 - the page prints '?TT = probably TTT'	Vox AC50 — Hunts capacitor date codes
TST	1964, week 45 — AC50 4282 and an early solid-state rectified unit	Vox AC50 — Hunts capacitor date codes
TDT	1964, week 48 — AC50, solid-state rectified, early	Vox AC50 — Hunts capacitor date codes
TAT	1964, week 49 — AC50 3680 - latest 1964 code recorded	Vox AC50 — Hunts capacitor date codes
YUS	1965, week 06 — AC50 4282	Vox AC50 — Hunts capacitor date codes
YNS	1965, week 07 — AC50 3709 - earliest 1965 code recorded	Vox AC50 — Hunts capacitor date codes
HUS	1965, week 26 — AC100 1367, blue Hunts 16 uF	www.voxac100.org.uk
IUS	1965, week 36 — AC100 1367, preamp filter cap	www.voxac100.org.uk
UYT	1966, week 04 — AC100 1367 and the 1900s-serial AC100s (from no. 1905): 'stocks evidently lasted some time'	www.voxac100.org.uk
D YW	1968, week 01 — printed with a space; year first: 8 01 = first week of 1968	Vox AC50 — Hunts capacitor date codes
SS	1965 — printed '?SS' - the page reads it as 'probably 5th or 15th week of 1965'; ambiguous, first letter unreadable	Vox AC50 — Hunts capacitor date codes

Dynaco — Hunts capacitor date code (WHITSUNDAY)

1950s-1969 (Hunts taken over by Erie in the late 1960s, probably 1969) · 25 rows · confidence Medium · Vox AC50 — Hunts capacitor date codes

Code as marked	Meaning	Source
YIW	1961, week 03 — AC50 s/n 1034B: week first (03), year last digit 1 -> 1961	Vox AC50 — Hunts capacitor date codes
WAI	1963, week 19 — same unit 1034B, second cap	Vox AC50 — Hunts capacitor date codes
ITD	1963, week 48 — reverse order (year letter first): 3 48 -> 1963 week 48; the page calls it out as an exception	Vox AC50 — Hunts capacitor date codes
WST	1964, week 15 — AC50 1411 / 1524 / 1678 (x2) - the most common code in large-box AC50s	Vox AC50 — Hunts capacitor date codes
HWT	1964, week 21 — AC50 1411, bias circuit cap	Vox AC50 — Hunts capacitor date codes
HUT	1964, week 26 — AC50 1786 and 1876	Vox AC50 — Hunts capacitor date codes
HNT	1964, week 27 — AC50 1727; probably also the '?NT' codes on 2031 and on an Australian unit	Vox AC50 — Hunts capacitor date codes
HDT	1964, week 28 — AC50 1311 (small-box twin channel), 1727, 1852	Vox AC50 — Hunts capacitor date codes
IYT	1964, week 30 — AC100 s/n 392, spent cathode-bypass caps; the page decodes week 30, year letter T = 1964	www.voxac100.org.uk
IST	1964, week 35 — AC50 1502	Vox AC50 — Hunts capacitor date codes
INT	1964, week 37 — AC50 1852	Vox AC50 — Hunts capacitor date codes
TWT	1964, week 41 — AC50 2644, 3615	Vox AC50 — Hunts capacitor date codes
THT	1964, week 42 — AC50 2620	Vox AC50 — Hunts capacitor date codes
TIT	1964, week 43 — AC50 2069 and two solid-state rectified units	Vox AC50 — Hunts capacitor date codes
TTT	1964, week 44 — AC50 - the page prints '?TT = probably TTT'	Vox AC50 — Hunts capacitor date codes
TST	1964, week 45 — AC50 4282 and an early solid-state rectified unit	Vox AC50 — Hunts capacitor date codes
TDT	1964, week 48 — AC50, solid-state rectified, early	Vox AC50 — Hunts capacitor date codes
TAT	1964, week 49 — AC50 3680 - latest 1964 code recorded	Vox AC50 — Hunts capacitor date codes
YUS	1965, week 06 — AC50 4282	Vox AC50 — Hunts capacitor date codes
YNS	1965, week 07 — AC50 3709 - earliest 1965 code recorded	Vox AC50 — Hunts capacitor date codes
HUS	1965, week 26 — AC100 1367, blue Hunts 16 uF	www.voxac100.org.uk
IUS	1965, week 36 — AC100 1367, preamp filter cap	www.voxac100.org.uk
UYT	1966, week 04 — AC100 1367 and the 1900s-serial AC100s (from no. 1905): 'stocks evidently lasted some time'	www.voxac100.org.uk
D YW	1968, week 01 — printed with a space; year first: 8 01 = first week of 1968	Vox AC50 — Hunts capacitor date codes
SS	1965 — printed '?SS' - the page reads it as 'probably 5th or 15th week of 1965'; ambiguous, first letter unreadable	Vox AC50 — Hunts capacitor date codes

Fisher Radio (The Fisher) — Hunts capacitor date code (WHITSUNDAY)

1950s-1969 (Hunts taken over by Erie in the late 1960s, probably 1969) · 25 rows · confidence Medium · Vox AC50 — Hunts capacitor date codes

Code as marked	Meaning	Source
YIW	1961, week 03 — AC50 s/n 1034B: week first (03), year last digit 1 -> 1961	Vox AC50 — Hunts capacitor date codes
WAI	1963, week 19 — same unit 1034B, second cap	Vox AC50 — Hunts capacitor date codes
ITD	1963, week 48 — reverse order (year letter first): 3 48 -> 1963 week 48; the page calls it out as an exception	Vox AC50 — Hunts capacitor date codes
WST	1964, week 15 — AC50 1411 / 1524 / 1678 (x2) - the most common code in large-box AC50s	Vox AC50 — Hunts capacitor date codes
HWT	1964, week 21 — AC50 1411, bias circuit cap	Vox AC50 — Hunts capacitor date codes
HUT	1964, week 26 — AC50 1786 and 1876	Vox AC50 — Hunts capacitor date codes
HNT	1964, week 27 — AC50 1727; probably also the '?NT' codes on 2031 and on an Australian unit	Vox AC50 — Hunts capacitor date codes
HDT	1964, week 28 — AC50 1311 (small-box twin channel), 1727, 1852	Vox AC50 — Hunts capacitor date codes
IYT	1964, week 30 — AC100 s/n 392, spent cathode-bypass caps; the page decodes week 30, year letter T = 1964	www.voxac100.org.uk
IST	1964, week 35 — AC50 1502	Vox AC50 — Hunts capacitor date codes
INT	1964, week 37 — AC50 1852	Vox AC50 — Hunts capacitor date codes
TWT	1964, week 41 — AC50 2644, 3615	Vox AC50 — Hunts capacitor date codes
THT	1964, week 42 — AC50 2620	Vox AC50 — Hunts capacitor date codes
TIT	1964, week 43 — AC50 2069 and two solid-state rectified units	Vox AC50 — Hunts capacitor date codes
TTT	1964, week 44 — AC50 - the page prints '?TT = probably TTT'	Vox AC50 — Hunts capacitor date codes
TST	1964, week 45 — AC50 4282 and an early solid-state rectified unit	Vox AC50 — Hunts capacitor date codes
TDT	1964, week 48 — AC50, solid-state rectified, early	Vox AC50 — Hunts capacitor date codes
TAT	1964, week 49 — AC50 3680 - latest 1964 code recorded	Vox AC50 — Hunts capacitor date codes
YUS	1965, week 06 — AC50 4282	Vox AC50 — Hunts capacitor date codes
YNS	1965, week 07 — AC50 3709 - earliest 1965 code recorded	Vox AC50 — Hunts capacitor date codes
HUS	1965, week 26 — AC100 1367, blue Hunts 16 uF	www.voxac100.org.uk
IUS	1965, week 36 — AC100 1367, preamp filter cap	www.voxac100.org.uk
UYT	1966, week 04 — AC100 1367 and the 1900s-serial AC100s (from no. 1905): 'stocks evidently lasted some time'	www.voxac100.org.uk
D YW	1968, week 01 — printed with a space; year first: 8 01 = first week of 1968	Vox AC50 — Hunts capacitor date codes
SS	1965 — printed '?SS' - the page reads it as 'probably 5th or 15th week of 1965'; ambiguous, first letter unreadable	Vox AC50 — Hunts capacitor date codes

H.H. Scott — Hunts capacitor date code (WHITSUNDAY)

1950s-1969 (Hunts taken over by Erie in the late 1960s, probably 1969) · 25 rows · confidence Medium · Vox AC50 — Hunts capacitor date codes

Code as marked	Meaning	Source
YIW	1961, week 03 — AC50 s/n 1034B: week first (03), year last digit 1 -> 1961	Vox AC50 — Hunts capacitor date codes
WAI	1963, week 19 — same unit 1034B, second cap	Vox AC50 — Hunts capacitor date codes
ITD	1963, week 48 — reverse order (year letter first): 3 48 -> 1963 week 48; the page calls it out as an exception	Vox AC50 — Hunts capacitor date codes
WST	1964, week 15 — AC50 1411 / 1524 / 1678 (x2) - the most common code in large-box AC50s	Vox AC50 — Hunts capacitor date codes
HWT	1964, week 21 — AC50 1411, bias circuit cap	Vox AC50 — Hunts capacitor date codes
HUT	1964, week 26 — AC50 1786 and 1876	Vox AC50 — Hunts capacitor date codes
HNT	1964, week 27 — AC50 1727; probably also the '?NT' codes on 2031 and on an Australian unit	Vox AC50 — Hunts capacitor date codes
HDT	1964, week 28 — AC50 1311 (small-box twin channel), 1727, 1852	Vox AC50 — Hunts capacitor date codes
IYT	1964, week 30 — AC100 s/n 392, spent cathode-bypass caps; the page decodes week 30, year letter T = 1964	www.voxac100.org.uk
IST	1964, week 35 — AC50 1502	Vox AC50 — Hunts capacitor date codes
INT	1964, week 37 — AC50 1852	Vox AC50 — Hunts capacitor date codes
TWT	1964, week 41 — AC50 2644, 3615	Vox AC50 — Hunts capacitor date codes
THT	1964, week 42 — AC50 2620	Vox AC50 — Hunts capacitor date codes
TIT	1964, week 43 — AC50 2069 and two solid-state rectified units	Vox AC50 — Hunts capacitor date codes
TTT	1964, week 44 — AC50 - the page prints '?TT = probably TTT'	Vox AC50 — Hunts capacitor date codes
TST	1964, week 45 — AC50 4282 and an early solid-state rectified unit	Vox AC50 — Hunts capacitor date codes
TDT	1964, week 48 — AC50, solid-state rectified, early	Vox AC50 — Hunts capacitor date codes
TAT	1964, week 49 — AC50 3680 - latest 1964 code recorded	Vox AC50 — Hunts capacitor date codes
YUS	1965, week 06 — AC50 4282	Vox AC50 — Hunts capacitor date codes
YNS	1965, week 07 — AC50 3709 - earliest 1965 code recorded	Vox AC50 — Hunts capacitor date codes
HUS	1965, week 26 — AC100 1367, blue Hunts 16 uF	www.voxac100.org.uk
IUS	1965, week 36 — AC100 1367, preamp filter cap	www.voxac100.org.uk
UYT	1966, week 04 — AC100 1367 and the 1900s-serial AC100s (from no. 1905): 'stocks evidently lasted some time'	www.voxac100.org.uk
D YW	1968, week 01 — printed with a space; year first: 8 01 = first week of 1968	Vox AC50 — Hunts capacitor date codes
SS	1965 — printed '?SS' - the page reads it as 'probably 5th or 15th week of 1965'; ambiguous, first letter unreadable	Vox AC50 — Hunts capacitor date codes

Garrard Engineering — Hunts capacitor date code (WHITSUNDAY)

1950s-1969 (Hunts taken over by Erie in the late 1960s, probably 1969) · 25 rows · confidence Medium · Vox AC50 — Hunts capacitor date codes

Code as marked	Meaning	Source
YIW	1961, week 03 — AC50 s/n 1034B: week first (03), year last digit 1 -> 1961	Vox AC50 — Hunts capacitor date codes
WAI	1963, week 19 — same unit 1034B, second cap	Vox AC50 — Hunts capacitor date codes
ITD	1963, week 48 — reverse order (year letter first): 3 48 -> 1963 week 48; the page calls it out as an exception	Vox AC50 — Hunts capacitor date codes
WST	1964, week 15 — AC50 1411 / 1524 / 1678 (x2) - the most common code in large-box AC50s	Vox AC50 — Hunts capacitor date codes
HWT	1964, week 21 — AC50 1411, bias circuit cap	Vox AC50 — Hunts capacitor date codes
HUT	1964, week 26 — AC50 1786 and 1876	Vox AC50 — Hunts capacitor date codes
HNT	1964, week 27 — AC50 1727; probably also the '?NT' codes on 2031 and on an Australian unit	Vox AC50 — Hunts capacitor date codes
HDT	1964, week 28 — AC50 1311 (small-box twin channel), 1727, 1852	Vox AC50 — Hunts capacitor date codes
IYT	1964, week 30 — AC100 s/n 392, spent cathode-bypass caps; the page decodes week 30, year letter T = 1964	www.voxac100.org.uk
IST	1964, week 35 — AC50 1502	Vox AC50 — Hunts capacitor date codes
INT	1964, week 37 — AC50 1852	Vox AC50 — Hunts capacitor date codes
TWT	1964, week 41 — AC50 2644, 3615	Vox AC50 — Hunts capacitor date codes
THT	1964, week 42 — AC50 2620	Vox AC50 — Hunts capacitor date codes
TIT	1964, week 43 — AC50 2069 and two solid-state rectified units	Vox AC50 — Hunts capacitor date codes
TTT	1964, week 44 — AC50 - the page prints '?TT = probably TTT'	Vox AC50 — Hunts capacitor date codes
TST	1964, week 45 — AC50 4282 and an early solid-state rectified unit	Vox AC50 — Hunts capacitor date codes
TDT	1964, week 48 — AC50, solid-state rectified, early	Vox AC50 — Hunts capacitor date codes
TAT	1964, week 49 — AC50 3680 - latest 1964 code recorded	Vox AC50 — Hunts capacitor date codes
YUS	1965, week 06 — AC50 4282	Vox AC50 — Hunts capacitor date codes
YNS	1965, week 07 — AC50 3709 - earliest 1965 code recorded	Vox AC50 — Hunts capacitor date codes
HUS	1965, week 26 — AC100 1367, blue Hunts 16 uF	www.voxac100.org.uk
IUS	1965, week 36 — AC100 1367, preamp filter cap	www.voxac100.org.uk
UYT	1966, week 04 — AC100 1367 and the 1900s-serial AC100s (from no. 1905): 'stocks evidently lasted some time'	www.voxac100.org.uk
D YW	1968, week 01 — printed with a space; year first: 8 01 = first week of 1968	Vox AC50 — Hunts capacitor date codes
SS	1965 — printed '?SS' - the page reads it as 'probably 5th or 15th week of 1965'; ambiguous, first letter unreadable	Vox AC50 — Hunts capacitor date codes

Dual (Gebrüder Steidinger) — Hunts capacitor date code (WHITSUNDAY)

1950s-1969 (Hunts taken over by Erie in the late 1960s, probably 1969) · 25 rows · confidence Medium · Vox AC50 — Hunts capacitor date codes

Code as marked	Meaning	Source
YIW	1961, week 03 — AC50 s/n 1034B: week first (03), year last digit 1 -> 1961	Vox AC50 — Hunts capacitor date codes
WAI	1963, week 19 — same unit 1034B, second cap	Vox AC50 — Hunts capacitor date codes
ITD	1963, week 48 — reverse order (year letter first): 3 48 -> 1963 week 48; the page calls it out as an exception	Vox AC50 — Hunts capacitor date codes
WST	1964, week 15 — AC50 1411 / 1524 / 1678 (x2) - the most common code in large-box AC50s	Vox AC50 — Hunts capacitor date codes
HWT	1964, week 21 — AC50 1411, bias circuit cap	Vox AC50 — Hunts capacitor date codes
HUT	1964, week 26 — AC50 1786 and 1876	Vox AC50 — Hunts capacitor date codes
HNT	1964, week 27 — AC50 1727; probably also the '?NT' codes on 2031 and on an Australian unit	Vox AC50 — Hunts capacitor date codes
HDT	1964, week 28 — AC50 1311 (small-box twin channel), 1727, 1852	Vox AC50 — Hunts capacitor date codes
IYT	1964, week 30 — AC100 s/n 392, spent cathode-bypass caps; the page decodes week 30, year letter T = 1964	www.voxac100.org.uk
IST	1964, week 35 — AC50 1502	Vox AC50 — Hunts capacitor date codes
INT	1964, week 37 — AC50 1852	Vox AC50 — Hunts capacitor date codes
TWT	1964, week 41 — AC50 2644, 3615	Vox AC50 — Hunts capacitor date codes
THT	1964, week 42 — AC50 2620	Vox AC50 — Hunts capacitor date codes
TIT	1964, week 43 — AC50 2069 and two solid-state rectified units	Vox AC50 — Hunts capacitor date codes
TTT	1964, week 44 — AC50 - the page prints '?TT = probably TTT'	Vox AC50 — Hunts capacitor date codes
TST	1964, week 45 — AC50 4282 and an early solid-state rectified unit	Vox AC50 — Hunts capacitor date codes
TDT	1964, week 48 — AC50, solid-state rectified, early	Vox AC50 — Hunts capacitor date codes
TAT	1964, week 49 — AC50 3680 - latest 1964 code recorded	Vox AC50 — Hunts capacitor date codes
YUS	1965, week 06 — AC50 4282	Vox AC50 — Hunts capacitor date codes
YNS	1965, week 07 — AC50 3709 - earliest 1965 code recorded	Vox AC50 — Hunts capacitor date codes
HUS	1965, week 26 — AC100 1367, blue Hunts 16 uF	www.voxac100.org.uk
IUS	1965, week 36 — AC100 1367, preamp filter cap	www.voxac100.org.uk
UYT	1966, week 04 — AC100 1367 and the 1900s-serial AC100s (from no. 1905): 'stocks evidently lasted some time'	www.voxac100.org.uk
D YW	1968, week 01 — printed with a space; year first: 8 01 = first week of 1968	Vox AC50 — Hunts capacitor date codes
SS	1965 — printed '?SS' - the page reads it as 'probably 5th or 15th week of 1965'; ambiguous, first letter unreadable	Vox AC50 — Hunts capacitor date codes

H.J. Leak & Co. — Hunts capacitor date code (WHITSUNDAY)

1950s-1969 (Hunts taken over by Erie in the late 1960s, probably 1969) · 25 rows · confidence Medium · Vox AC50 — Hunts capacitor date codes

Code as marked	Meaning	Source
YIW	1961, week 03 — AC50 s/n 1034B: week first (03), year last digit 1 -> 1961	Vox AC50 — Hunts capacitor date codes
WAI	1963, week 19 — same unit 1034B, second cap	Vox AC50 — Hunts capacitor date codes
ITD	1963, week 48 — reverse order (year letter first): 3 48 -> 1963 week 48; the page calls it out as an exception	Vox AC50 — Hunts capacitor date codes
WST	1964, week 15 — AC50 1411 / 1524 / 1678 (x2) - the most common code in large-box AC50s	Vox AC50 — Hunts capacitor date codes
HWT	1964, week 21 — AC50 1411, bias circuit cap	Vox AC50 — Hunts capacitor date codes
HUT	1964, week 26 — AC50 1786 and 1876	Vox AC50 — Hunts capacitor date codes
HNT	1964, week 27 — AC50 1727; probably also the '?NT' codes on 2031 and on an Australian unit	Vox AC50 — Hunts capacitor date codes
HDT	1964, week 28 — AC50 1311 (small-box twin channel), 1727, 1852	Vox AC50 — Hunts capacitor date codes
IYT	1964, week 30 — AC100 s/n 392, spent cathode-bypass caps; the page decodes week 30, year letter T = 1964	www.voxac100.org.uk
IST	1964, week 35 — AC50 1502	Vox AC50 — Hunts capacitor date codes
INT	1964, week 37 — AC50 1852	Vox AC50 — Hunts capacitor date codes
TWT	1964, week 41 — AC50 2644, 3615	Vox AC50 — Hunts capacitor date codes
THT	1964, week 42 — AC50 2620	Vox AC50 — Hunts capacitor date codes
TIT	1964, week 43 — AC50 2069 and two solid-state rectified units	Vox AC50 — Hunts capacitor date codes
TTT	1964, week 44 — AC50 - the page prints '?TT = probably TTT'	Vox AC50 — Hunts capacitor date codes
TST	1964, week 45 — AC50 4282 and an early solid-state rectified unit	Vox AC50 — Hunts capacitor date codes
TDT	1964, week 48 — AC50, solid-state rectified, early	Vox AC50 — Hunts capacitor date codes
TAT	1964, week 49 — AC50 3680 - latest 1964 code recorded	Vox AC50 — Hunts capacitor date codes
YUS	1965, week 06 — AC50 4282	Vox AC50 — Hunts capacitor date codes
YNS	1965, week 07 — AC50 3709 - earliest 1965 code recorded	Vox AC50 — Hunts capacitor date codes
HUS	1965, week 26 — AC100 1367, blue Hunts 16 uF	www.voxac100.org.uk
IUS	1965, week 36 — AC100 1367, preamp filter cap	www.voxac100.org.uk
UYT	1966, week 04 — AC100 1367 and the 1900s-serial AC100s (from no. 1905): 'stocks evidently lasted some time'	www.voxac100.org.uk
D YW	1968, week 01 — printed with a space; year first: 8 01 = first week of 1968	Vox AC50 — Hunts capacitor date codes
SS	1965 — printed '?SS' - the page reads it as 'probably 5th or 15th week of 1965'; ambiguous, first letter unreadable	Vox AC50 — Hunts capacitor date codes

Heath Company (Heathkit) — Hunts capacitor date code (WHITSUNDAY)

1950s-1969 (Hunts taken over by Erie in the late 1960s, probably 1969) · 25 rows · confidence Medium · Vox AC50 — Hunts capacitor date codes

Code as marked	Meaning	Source
YIW	1961, week 03 — AC50 s/n 1034B: week first (03), year last digit 1 -> 1961	Vox AC50 — Hunts capacitor date codes
WAI	1963, week 19 — same unit 1034B, second cap	Vox AC50 — Hunts capacitor date codes
ITD	1963, week 48 — reverse order (year letter first): 3 48 -> 1963 week 48; the page calls it out as an exception	Vox AC50 — Hunts capacitor date codes
WST	1964, week 15 — AC50 1411 / 1524 / 1678 (x2) - the most common code in large-box AC50s	Vox AC50 — Hunts capacitor date codes
HWT	1964, week 21 — AC50 1411, bias circuit cap	Vox AC50 — Hunts capacitor date codes
HUT	1964, week 26 — AC50 1786 and 1876	Vox AC50 — Hunts capacitor date codes
HNT	1964, week 27 — AC50 1727; probably also the '?NT' codes on 2031 and on an Australian unit	Vox AC50 — Hunts capacitor date codes
HDT	1964, week 28 — AC50 1311 (small-box twin channel), 1727, 1852	Vox AC50 — Hunts capacitor date codes
IYT	1964, week 30 — AC100 s/n 392, spent cathode-bypass caps; the page decodes week 30, year letter T = 1964	www.voxac100.org.uk
IST	1964, week 35 — AC50 1502	Vox AC50 — Hunts capacitor date codes
INT	1964, week 37 — AC50 1852	Vox AC50 — Hunts capacitor date codes
TWT	1964, week 41 — AC50 2644, 3615	Vox AC50 — Hunts capacitor date codes
THT	1964, week 42 — AC50 2620	Vox AC50 — Hunts capacitor date codes
TIT	1964, week 43 — AC50 2069 and two solid-state rectified units	Vox AC50 — Hunts capacitor date codes
TTT	1964, week 44 — AC50 - the page prints '?TT = probably TTT'	Vox AC50 — Hunts capacitor date codes
TST	1964, week 45 — AC50 4282 and an early solid-state rectified unit	Vox AC50 — Hunts capacitor date codes
TDT	1964, week 48 — AC50, solid-state rectified, early	Vox AC50 — Hunts capacitor date codes
TAT	1964, week 49 — AC50 3680 - latest 1964 code recorded	Vox AC50 — Hunts capacitor date codes
YUS	1965, week 06 — AC50 4282	Vox AC50 — Hunts capacitor date codes
YNS	1965, week 07 — AC50 3709 - earliest 1965 code recorded	Vox AC50 — Hunts capacitor date codes
HUS	1965, week 26 — AC100 1367, blue Hunts 16 uF	www.voxac100.org.uk
IUS	1965, week 36 — AC100 1367, preamp filter cap	www.voxac100.org.uk
UYT	1966, week 04 — AC100 1367 and the 1900s-serial AC100s (from no. 1905): 'stocks evidently lasted some time'	www.voxac100.org.uk
D YW	1968, week 01 — printed with a space; year first: 8 01 = first week of 1968	Vox AC50 — Hunts capacitor date codes
SS	1965 — printed '?SS' - the page reads it as 'probably 5th or 15th week of 1965'; ambiguous, first letter unreadable	Vox AC50 — Hunts capacitor date codes

Electronic Instrument Co. (EICO) — Hunts capacitor date code (WHITSUNDAY)

1950s-1969 (Hunts taken over by Erie in the late 1960s, probably 1969) · 25 rows · confidence Medium · Vox AC50 — Hunts capacitor date codes

Code as marked	Meaning	Source
YIW	1961, week 03 — AC50 s/n 1034B: week first (03), year last digit 1 -> 1961	Vox AC50 — Hunts capacitor date codes
WAI	1963, week 19 — same unit 1034B, second cap	Vox AC50 — Hunts capacitor date codes
ITD	1963, week 48 — reverse order (year letter first): 3 48 -> 1963 week 48; the page calls it out as an exception	Vox AC50 — Hunts capacitor date codes
WST	1964, week 15 — AC50 1411 / 1524 / 1678 (x2) - the most common code in large-box AC50s	Vox AC50 — Hunts capacitor date codes
HWT	1964, week 21 — AC50 1411, bias circuit cap	Vox AC50 — Hunts capacitor date codes
HUT	1964, week 26 — AC50 1786 and 1876	Vox AC50 — Hunts capacitor date codes
HNT	1964, week 27 — AC50 1727; probably also the '?NT' codes on 2031 and on an Australian unit	Vox AC50 — Hunts capacitor date codes
HDT	1964, week 28 — AC50 1311 (small-box twin channel), 1727, 1852	Vox AC50 — Hunts capacitor date codes
IYT	1964, week 30 — AC100 s/n 392, spent cathode-bypass caps; the page decodes week 30, year letter T = 1964	www.voxac100.org.uk
IST	1964, week 35 — AC50 1502	Vox AC50 — Hunts capacitor date codes
INT	1964, week 37 — AC50 1852	Vox AC50 — Hunts capacitor date codes
TWT	1964, week 41 — AC50 2644, 3615	Vox AC50 — Hunts capacitor date codes
THT	1964, week 42 — AC50 2620	Vox AC50 — Hunts capacitor date codes
TIT	1964, week 43 — AC50 2069 and two solid-state rectified units	Vox AC50 — Hunts capacitor date codes
TTT	1964, week 44 — AC50 - the page prints '?TT = probably TTT'	Vox AC50 — Hunts capacitor date codes
TST	1964, week 45 — AC50 4282 and an early solid-state rectified unit	Vox AC50 — Hunts capacitor date codes
TDT	1964, week 48 — AC50, solid-state rectified, early	Vox AC50 — Hunts capacitor date codes
TAT	1964, week 49 — AC50 3680 - latest 1964 code recorded	Vox AC50 — Hunts capacitor date codes
YUS	1965, week 06 — AC50 4282	Vox AC50 — Hunts capacitor date codes
YNS	1965, week 07 — AC50 3709 - earliest 1965 code recorded	Vox AC50 — Hunts capacitor date codes
HUS	1965, week 26 — AC100 1367, blue Hunts 16 uF	www.voxac100.org.uk
IUS	1965, week 36 — AC100 1367, preamp filter cap	www.voxac100.org.uk
UYT	1966, week 04 — AC100 1367 and the 1900s-serial AC100s (from no. 1905): 'stocks evidently lasted some time'	www.voxac100.org.uk
D YW	1968, week 01 — printed with a space; year first: 8 01 = first week of 1968	Vox AC50 — Hunts capacitor date codes
SS	1965 — printed '?SS' - the page reads it as 'probably 5th or 15th week of 1965'; ambiguous, first letter unreadable	Vox AC50 — Hunts capacitor date codes

Allied Radio (Knight-Kit) — Hunts capacitor date code (WHITSUNDAY)

1950s-1969 (Hunts taken over by Erie in the late 1960s, probably 1969) · 25 rows · confidence Medium · Vox AC50 — Hunts capacitor date codes

Code as marked	Meaning	Source
YIW	1961, week 03 — AC50 s/n 1034B: week first (03), year last digit 1 -> 1961	Vox AC50 — Hunts capacitor date codes
WAI	1963, week 19 — same unit 1034B, second cap	Vox AC50 — Hunts capacitor date codes
ITD	1963, week 48 — reverse order (year letter first): 3 48 -> 1963 week 48; the page calls it out as an exception	Vox AC50 — Hunts capacitor date codes
WST	1964, week 15 — AC50 1411 / 1524 / 1678 (x2) - the most common code in large-box AC50s	Vox AC50 — Hunts capacitor date codes
HWT	1964, week 21 — AC50 1411, bias circuit cap	Vox AC50 — Hunts capacitor date codes
HUT	1964, week 26 — AC50 1786 and 1876	Vox AC50 — Hunts capacitor date codes
HNT	1964, week 27 — AC50 1727; probably also the '?NT' codes on 2031 and on an Australian unit	Vox AC50 — Hunts capacitor date codes
HDT	1964, week 28 — AC50 1311 (small-box twin channel), 1727, 1852	Vox AC50 — Hunts capacitor date codes
IYT	1964, week 30 — AC100 s/n 392, spent cathode-bypass caps; the page decodes week 30, year letter T = 1964	www.voxac100.org.uk
IST	1964, week 35 — AC50 1502	Vox AC50 — Hunts capacitor date codes
INT	1964, week 37 — AC50 1852	Vox AC50 — Hunts capacitor date codes
TWT	1964, week 41 — AC50 2644, 3615	Vox AC50 — Hunts capacitor date codes
THT	1964, week 42 — AC50 2620	Vox AC50 — Hunts capacitor date codes
TIT	1964, week 43 — AC50 2069 and two solid-state rectified units	Vox AC50 — Hunts capacitor date codes
TTT	1964, week 44 — AC50 - the page prints '?TT = probably TTT'	Vox AC50 — Hunts capacitor date codes
TST	1964, week 45 — AC50 4282 and an early solid-state rectified unit	Vox AC50 — Hunts capacitor date codes
TDT	1964, week 48 — AC50, solid-state rectified, early	Vox AC50 — Hunts capacitor date codes
TAT	1964, week 49 — AC50 3680 - latest 1964 code recorded	Vox AC50 — Hunts capacitor date codes
YUS	1965, week 06 — AC50 4282	Vox AC50 — Hunts capacitor date codes
YNS	1965, week 07 — AC50 3709 - earliest 1965 code recorded	Vox AC50 — Hunts capacitor date codes
HUS	1965, week 26 — AC100 1367, blue Hunts 16 uF	www.voxac100.org.uk
IUS	1965, week 36 — AC100 1367, preamp filter cap	www.voxac100.org.uk
UYT	1966, week 04 — AC100 1367 and the 1900s-serial AC100s (from no. 1905): 'stocks evidently lasted some time'	www.voxac100.org.uk
D YW	1968, week 01 — printed with a space; year first: 8 01 = first week of 1968	Vox AC50 — Hunts capacitor date codes
SS	1965 — printed '?SS' - the page reads it as 'probably 5th or 15th week of 1965'; ambiguous, first letter unreadable	Vox AC50 — Hunts capacitor date codes

Harman Kardon — Hunts capacitor date code (WHITSUNDAY)

1950s-1969 (Hunts taken over by Erie in the late 1960s, probably 1969) · 25 rows · confidence Medium · Vox AC50 — Hunts capacitor date codes

Code as marked	Meaning	Source
YIW	1961, week 03 — AC50 s/n 1034B: week first (03), year last digit 1 -> 1961	Vox AC50 — Hunts capacitor date codes
WAI	1963, week 19 — same unit 1034B, second cap	Vox AC50 — Hunts capacitor date codes
ITD	1963, week 48 — reverse order (year letter first): 3 48 -> 1963 week 48; the page calls it out as an exception	Vox AC50 — Hunts capacitor date codes
WST	1964, week 15 — AC50 1411 / 1524 / 1678 (x2) - the most common code in large-box AC50s	Vox AC50 — Hunts capacitor date codes
HWT	1964, week 21 — AC50 1411, bias circuit cap	Vox AC50 — Hunts capacitor date codes
HUT	1964, week 26 — AC50 1786 and 1876	Vox AC50 — Hunts capacitor date codes
HNT	1964, week 27 — AC50 1727; probably also the '?NT' codes on 2031 and on an Australian unit	Vox AC50 — Hunts capacitor date codes
HDT	1964, week 28 — AC50 1311 (small-box twin channel), 1727, 1852	Vox AC50 — Hunts capacitor date codes
IYT	1964, week 30 — AC100 s/n 392, spent cathode-bypass caps; the page decodes week 30, year letter T = 1964	www.voxac100.org.uk
IST	1964, week 35 — AC50 1502	Vox AC50 — Hunts capacitor date codes
INT	1964, week 37 — AC50 1852	Vox AC50 — Hunts capacitor date codes
TWT	1964, week 41 — AC50 2644, 3615	Vox AC50 — Hunts capacitor date codes
THT	1964, week 42 — AC50 2620	Vox AC50 — Hunts capacitor date codes
TIT	1964, week 43 — AC50 2069 and two solid-state rectified units	Vox AC50 — Hunts capacitor date codes
TTT	1964, week 44 — AC50 - the page prints '?TT = probably TTT'	Vox AC50 — Hunts capacitor date codes
TST	1964, week 45 — AC50 4282 and an early solid-state rectified unit	Vox AC50 — Hunts capacitor date codes
TDT	1964, week 48 — AC50, solid-state rectified, early	Vox AC50 — Hunts capacitor date codes
TAT	1964, week 49 — AC50 3680 - latest 1964 code recorded	Vox AC50 — Hunts capacitor date codes
YUS	1965, week 06 — AC50 4282	Vox AC50 — Hunts capacitor date codes
YNS	1965, week 07 — AC50 3709 - earliest 1965 code recorded	Vox AC50 — Hunts capacitor date codes
HUS	1965, week 26 — AC100 1367, blue Hunts 16 uF	www.voxac100.org.uk
IUS	1965, week 36 — AC100 1367, preamp filter cap	www.voxac100.org.uk
UYT	1966, week 04 — AC100 1367 and the 1900s-serial AC100s (from no. 1905): 'stocks evidently lasted some time'	www.voxac100.org.uk
D YW	1968, week 01 — printed with a space; year first: 8 01 = first week of 1968	Vox AC50 — Hunts capacitor date codes
SS	1965 — printed '?SS' - the page reads it as 'probably 5th or 15th week of 1965'; ambiguous, first letter unreadable	Vox AC50 — Hunts capacitor date codes

Sherwood Electronic Laboratories — Hunts capacitor date code (WHITSUNDAY)

1950s-1969 (Hunts taken over by Erie in the late 1960s, probably 1969) · 25 rows · confidence Medium · Vox AC50 — Hunts capacitor date codes

Code as marked	Meaning	Source
YIW	1961, week 03 — AC50 s/n 1034B: week first (03), year last digit 1 -> 1961	Vox AC50 — Hunts capacitor date codes
WAI	1963, week 19 — same unit 1034B, second cap	Vox AC50 — Hunts capacitor date codes
ITD	1963, week 48 — reverse order (year letter first): 3 48 -> 1963 week 48; the page calls it out as an exception	Vox AC50 — Hunts capacitor date codes
WST	1964, week 15 — AC50 1411 / 1524 / 1678 (x2) - the most common code in large-box AC50s	Vox AC50 — Hunts capacitor date codes
HWT	1964, week 21 — AC50 1411, bias circuit cap	Vox AC50 — Hunts capacitor date codes
HUT	1964, week 26 — AC50 1786 and 1876	Vox AC50 — Hunts capacitor date codes
HNT	1964, week 27 — AC50 1727; probably also the '?NT' codes on 2031 and on an Australian unit	Vox AC50 — Hunts capacitor date codes
HDT	1964, week 28 — AC50 1311 (small-box twin channel), 1727, 1852	Vox AC50 — Hunts capacitor date codes
IYT	1964, week 30 — AC100 s/n 392, spent cathode-bypass caps; the page decodes week 30, year letter T = 1964	www.voxac100.org.uk
IST	1964, week 35 — AC50 1502	Vox AC50 — Hunts capacitor date codes
INT	1964, week 37 — AC50 1852	Vox AC50 — Hunts capacitor date codes
TWT	1964, week 41 — AC50 2644, 3615	Vox AC50 — Hunts capacitor date codes
THT	1964, week 42 — AC50 2620	Vox AC50 — Hunts capacitor date codes
TIT	1964, week 43 — AC50 2069 and two solid-state rectified units	Vox AC50 — Hunts capacitor date codes
TTT	1964, week 44 — AC50 - the page prints '?TT = probably TTT'	Vox AC50 — Hunts capacitor date codes
TST	1964, week 45 — AC50 4282 and an early solid-state rectified unit	Vox AC50 — Hunts capacitor date codes
TDT	1964, week 48 — AC50, solid-state rectified, early	Vox AC50 — Hunts capacitor date codes
TAT	1964, week 49 — AC50 3680 - latest 1964 code recorded	Vox AC50 — Hunts capacitor date codes
YUS	1965, week 06 — AC50 4282	Vox AC50 — Hunts capacitor date codes
YNS	1965, week 07 — AC50 3709 - earliest 1965 code recorded	Vox AC50 — Hunts capacitor date codes
HUS	1965, week 26 — AC100 1367, blue Hunts 16 uF	www.voxac100.org.uk
IUS	1965, week 36 — AC100 1367, preamp filter cap	www.voxac100.org.uk
UYT	1966, week 04 — AC100 1367 and the 1900s-serial AC100s (from no. 1905): 'stocks evidently lasted some time'	www.voxac100.org.uk
D YW	1968, week 01 — printed with a space; year first: 8 01 = first week of 1968	Vox AC50 — Hunts capacitor date codes
SS	1965 — printed '?SS' - the page reads it as 'probably 5th or 15th week of 1965'; ambiguous, first letter unreadable	Vox AC50 — Hunts capacitor date codes

Radford Electronics — Hunts capacitor date code (WHITSUNDAY)

1950s-1969 (Hunts taken over by Erie in the late 1960s, probably 1969) · 25 rows · confidence Medium · Vox AC50 — Hunts capacitor date codes

Code as marked	Meaning	Source
YIW	1961, week 03 — AC50 s/n 1034B: week first (03), year last digit 1 -> 1961	Vox AC50 — Hunts capacitor date codes
WAI	1963, week 19 — same unit 1034B, second cap	Vox AC50 — Hunts capacitor date codes
ITD	1963, week 48 — reverse order (year letter first): 3 48 -> 1963 week 48; the page calls it out as an exception	Vox AC50 — Hunts capacitor date codes
WST	1964, week 15 — AC50 1411 / 1524 / 1678 (x2) - the most common code in large-box AC50s	Vox AC50 — Hunts capacitor date codes
HWT	1964, week 21 — AC50 1411, bias circuit cap	Vox AC50 — Hunts capacitor date codes
HUT	1964, week 26 — AC50 1786 and 1876	Vox AC50 — Hunts capacitor date codes
HNT	1964, week 27 — AC50 1727; probably also the '?NT' codes on 2031 and on an Australian unit	Vox AC50 — Hunts capacitor date codes
HDT	1964, week 28 — AC50 1311 (small-box twin channel), 1727, 1852	Vox AC50 — Hunts capacitor date codes
IYT	1964, week 30 — AC100 s/n 392, spent cathode-bypass caps; the page decodes week 30, year letter T = 1964	www.voxac100.org.uk
IST	1964, week 35 — AC50 1502	Vox AC50 — Hunts capacitor date codes
INT	1964, week 37 — AC50 1852	Vox AC50 — Hunts capacitor date codes
TWT	1964, week 41 — AC50 2644, 3615	Vox AC50 — Hunts capacitor date codes
THT	1964, week 42 — AC50 2620	Vox AC50 — Hunts capacitor date codes
TIT	1964, week 43 — AC50 2069 and two solid-state rectified units	Vox AC50 — Hunts capacitor date codes
TTT	1964, week 44 — AC50 - the page prints '?TT = probably TTT'	Vox AC50 — Hunts capacitor date codes
TST	1964, week 45 — AC50 4282 and an early solid-state rectified unit	Vox AC50 — Hunts capacitor date codes
TDT	1964, week 48 — AC50, solid-state rectified, early	Vox AC50 — Hunts capacitor date codes
TAT	1964, week 49 — AC50 3680 - latest 1964 code recorded	Vox AC50 — Hunts capacitor date codes
YUS	1965, week 06 — AC50 4282	Vox AC50 — Hunts capacitor date codes
YNS	1965, week 07 — AC50 3709 - earliest 1965 code recorded	Vox AC50 — Hunts capacitor date codes
HUS	1965, week 26 — AC100 1367, blue Hunts 16 uF	www.voxac100.org.uk
IUS	1965, week 36 — AC100 1367, preamp filter cap	www.voxac100.org.uk
UYT	1966, week 04 — AC100 1367 and the 1900s-serial AC100s (from no. 1905): 'stocks evidently lasted some time'	www.voxac100.org.uk
D YW	1968, week 01 — printed with a space; year first: 8 01 = first week of 1968	Vox AC50 — Hunts capacitor date codes
SS	1965 — printed '?SS' - the page reads it as 'probably 5th or 15th week of 1965'; ambiguous, first letter unreadable	Vox AC50 — Hunts capacitor date codes

Accuphase Laboratory — Hunts capacitor date code (WHITSUNDAY)

1950s-1969 (Hunts taken over by Erie in the late 1960s, probably 1969) · 25 rows · confidence Medium · Vox AC50 — Hunts capacitor date codes

Code as marked	Meaning	Source
YIW	1961, week 03 — AC50 s/n 1034B: week first (03), year last digit 1 -> 1961	Vox AC50 — Hunts capacitor date codes
WAI	1963, week 19 — same unit 1034B, second cap	Vox AC50 — Hunts capacitor date codes
ITD	1963, week 48 — reverse order (year letter first): 3 48 -> 1963 week 48; the page calls it out as an exception	Vox AC50 — Hunts capacitor date codes
WST	1964, week 15 — AC50 1411 / 1524 / 1678 (x2) - the most common code in large-box AC50s	Vox AC50 — Hunts capacitor date codes
HWT	1964, week 21 — AC50 1411, bias circuit cap	Vox AC50 — Hunts capacitor date codes
HUT	1964, week 26 — AC50 1786 and 1876	Vox AC50 — Hunts capacitor date codes
HNT	1964, week 27 — AC50 1727; probably also the '?NT' codes on 2031 and on an Australian unit	Vox AC50 — Hunts capacitor date codes
HDT	1964, week 28 — AC50 1311 (small-box twin channel), 1727, 1852	Vox AC50 — Hunts capacitor date codes
IYT	1964, week 30 — AC100 s/n 392, spent cathode-bypass caps; the page decodes week 30, year letter T = 1964	www.voxac100.org.uk
IST	1964, week 35 — AC50 1502	Vox AC50 — Hunts capacitor date codes
INT	1964, week 37 — AC50 1852	Vox AC50 — Hunts capacitor date codes
TWT	1964, week 41 — AC50 2644, 3615	Vox AC50 — Hunts capacitor date codes
THT	1964, week 42 — AC50 2620	Vox AC50 — Hunts capacitor date codes
TIT	1964, week 43 — AC50 2069 and two solid-state rectified units	Vox AC50 — Hunts capacitor date codes
TTT	1964, week 44 — AC50 - the page prints '?TT = probably TTT'	Vox AC50 — Hunts capacitor date codes
TST	1964, week 45 — AC50 4282 and an early solid-state rectified unit	Vox AC50 — Hunts capacitor date codes
TDT	1964, week 48 — AC50, solid-state rectified, early	Vox AC50 — Hunts capacitor date codes
TAT	1964, week 49 — AC50 3680 - latest 1964 code recorded	Vox AC50 — Hunts capacitor date codes
YUS	1965, week 06 — AC50 4282	Vox AC50 — Hunts capacitor date codes
YNS	1965, week 07 — AC50 3709 - earliest 1965 code recorded	Vox AC50 — Hunts capacitor date codes
HUS	1965, week 26 — AC100 1367, blue Hunts 16 uF	www.voxac100.org.uk
IUS	1965, week 36 — AC100 1367, preamp filter cap	www.voxac100.org.uk
UYT	1966, week 04 — AC100 1367 and the 1900s-serial AC100s (from no. 1905): 'stocks evidently lasted some time'	www.voxac100.org.uk
D YW	1968, week 01 — printed with a space; year first: 8 01 = first week of 1968	Vox AC50 — Hunts capacitor date codes
SS	1965 — printed '?SS' - the page reads it as 'probably 5th or 15th week of 1965'; ambiguous, first letter unreadable	Vox AC50 — Hunts capacitor date codes

Luxman — Hunts capacitor date code (WHITSUNDAY)

1950s-1969 (Hunts taken over by Erie in the late 1960s, probably 1969) · 25 rows · confidence Medium · Vox AC50 — Hunts capacitor date codes

Code as marked	Meaning	Source
YIW	1961, week 03 — AC50 s/n 1034B: week first (03), year last digit 1 -> 1961	Vox AC50 — Hunts capacitor date codes
WAI	1963, week 19 — same unit 1034B, second cap	Vox AC50 — Hunts capacitor date codes
ITD	1963, week 48 — reverse order (year letter first): 3 48 -> 1963 week 48; the page calls it out as an exception	Vox AC50 — Hunts capacitor date codes
WST	1964, week 15 — AC50 1411 / 1524 / 1678 (x2) - the most common code in large-box AC50s	Vox AC50 — Hunts capacitor date codes
HWT	1964, week 21 — AC50 1411, bias circuit cap	Vox AC50 — Hunts capacitor date codes
HUT	1964, week 26 — AC50 1786 and 1876	Vox AC50 — Hunts capacitor date codes
HNT	1964, week 27 — AC50 1727; probably also the '?NT' codes on 2031 and on an Australian unit	Vox AC50 — Hunts capacitor date codes
HDT	1964, week 28 — AC50 1311 (small-box twin channel), 1727, 1852	Vox AC50 — Hunts capacitor date codes
IYT	1964, week 30 — AC100 s/n 392, spent cathode-bypass caps; the page decodes week 30, year letter T = 1964	www.voxac100.org.uk
IST	1964, week 35 — AC50 1502	Vox AC50 — Hunts capacitor date codes
INT	1964, week 37 — AC50 1852	Vox AC50 — Hunts capacitor date codes
TWT	1964, week 41 — AC50 2644, 3615	Vox AC50 — Hunts capacitor date codes
THT	1964, week 42 — AC50 2620	Vox AC50 — Hunts capacitor date codes
TIT	1964, week 43 — AC50 2069 and two solid-state rectified units	Vox AC50 — Hunts capacitor date codes
TTT	1964, week 44 — AC50 - the page prints '?TT = probably TTT'	Vox AC50 — Hunts capacitor date codes
TST	1964, week 45 — AC50 4282 and an early solid-state rectified unit	Vox AC50 — Hunts capacitor date codes
TDT	1964, week 48 — AC50, solid-state rectified, early	Vox AC50 — Hunts capacitor date codes
TAT	1964, week 49 — AC50 3680 - latest 1964 code recorded	Vox AC50 — Hunts capacitor date codes
YUS	1965, week 06 — AC50 4282	Vox AC50 — Hunts capacitor date codes
YNS	1965, week 07 — AC50 3709 - earliest 1965 code recorded	Vox AC50 — Hunts capacitor date codes
HUS	1965, week 26 — AC100 1367, blue Hunts 16 uF	www.voxac100.org.uk
IUS	1965, week 36 — AC100 1367, preamp filter cap	www.voxac100.org.uk
UYT	1966, week 04 — AC100 1367 and the 1900s-serial AC100s (from no. 1905): 'stocks evidently lasted some time'	www.voxac100.org.uk
D YW	1968, week 01 — printed with a space; year first: 8 01 = first week of 1968	Vox AC50 — Hunts capacitor date codes
SS	1965 — printed '?SS' - the page reads it as 'probably 5th or 15th week of 1965'; ambiguous, first letter unreadable	Vox AC50 — Hunts capacitor date codes

Yamaha (Hi-Fi) — Hunts capacitor date code (WHITSUNDAY)

1950s-1969 (Hunts taken over by Erie in the late 1960s, probably 1969) · 25 rows · confidence Medium · Vox AC50 — Hunts capacitor date codes

Code as marked	Meaning	Source
YIW	1961, week 03 — AC50 s/n 1034B: week first (03), year last digit 1 -> 1961	Vox AC50 — Hunts capacitor date codes
WAI	1963, week 19 — same unit 1034B, second cap	Vox AC50 — Hunts capacitor date codes
ITD	1963, week 48 — reverse order (year letter first): 3 48 -> 1963 week 48; the page calls it out as an exception	Vox AC50 — Hunts capacitor date codes
WST	1964, week 15 — AC50 1411 / 1524 / 1678 (x2) - the most common code in large-box AC50s	Vox AC50 — Hunts capacitor date codes
HWT	1964, week 21 — AC50 1411, bias circuit cap	Vox AC50 — Hunts capacitor date codes
HUT	1964, week 26 — AC50 1786 and 1876	Vox AC50 — Hunts capacitor date codes
HNT	1964, week 27 — AC50 1727; probably also the '?NT' codes on 2031 and on an Australian unit	Vox AC50 — Hunts capacitor date codes
HDT	1964, week 28 — AC50 1311 (small-box twin channel), 1727, 1852	Vox AC50 — Hunts capacitor date codes
IYT	1964, week 30 — AC100 s/n 392, spent cathode-bypass caps; the page decodes week 30, year letter T = 1964	www.voxac100.org.uk
IST	1964, week 35 — AC50 1502	Vox AC50 — Hunts capacitor date codes
INT	1964, week 37 — AC50 1852	Vox AC50 — Hunts capacitor date codes
TWT	1964, week 41 — AC50 2644, 3615	Vox AC50 — Hunts capacitor date codes
THT	1964, week 42 — AC50 2620	Vox AC50 — Hunts capacitor date codes
TIT	1964, week 43 — AC50 2069 and two solid-state rectified units	Vox AC50 — Hunts capacitor date codes
TTT	1964, week 44 — AC50 - the page prints '?TT = probably TTT'	Vox AC50 — Hunts capacitor date codes
TST	1964, week 45 — AC50 4282 and an early solid-state rectified unit	Vox AC50 — Hunts capacitor date codes
TDT	1964, week 48 — AC50, solid-state rectified, early	Vox AC50 — Hunts capacitor date codes
TAT	1964, week 49 — AC50 3680 - latest 1964 code recorded	Vox AC50 — Hunts capacitor date codes
YUS	1965, week 06 — AC50 4282	Vox AC50 — Hunts capacitor date codes
YNS	1965, week 07 — AC50 3709 - earliest 1965 code recorded	Vox AC50 — Hunts capacitor date codes
HUS	1965, week 26 — AC100 1367, blue Hunts 16 uF	www.voxac100.org.uk
IUS	1965, week 36 — AC100 1367, preamp filter cap	www.voxac100.org.uk
UYT	1966, week 04 — AC100 1367 and the 1900s-serial AC100s (from no. 1905): 'stocks evidently lasted some time'	www.voxac100.org.uk
D YW	1968, week 01 — printed with a space; year first: 8 01 = first week of 1968	Vox AC50 — Hunts capacitor date codes
SS	1965 — printed '?SS' - the page reads it as 'probably 5th or 15th week of 1965'; ambiguous, first letter unreadable	Vox AC50 — Hunts capacitor date codes

Sansui Electric — Hunts capacitor date code (WHITSUNDAY)

1950s-1969 (Hunts taken over by Erie in the late 1960s, probably 1969) · 25 rows · confidence Medium · Vox AC50 — Hunts capacitor date codes

Code as marked	Meaning	Source
YIW	1961, week 03 — AC50 s/n 1034B: week first (03), year last digit 1 -> 1961	Vox AC50 — Hunts capacitor date codes
WAI	1963, week 19 — same unit 1034B, second cap	Vox AC50 — Hunts capacitor date codes
ITD	1963, week 48 — reverse order (year letter first): 3 48 -> 1963 week 48; the page calls it out as an exception	Vox AC50 — Hunts capacitor date codes
WST	1964, week 15 — AC50 1411 / 1524 / 1678 (x2) - the most common code in large-box AC50s	Vox AC50 — Hunts capacitor date codes
HWT	1964, week 21 — AC50 1411, bias circuit cap	Vox AC50 — Hunts capacitor date codes
HUT	1964, week 26 — AC50 1786 and 1876	Vox AC50 — Hunts capacitor date codes
HNT	1964, week 27 — AC50 1727; probably also the '?NT' codes on 2031 and on an Australian unit	Vox AC50 — Hunts capacitor date codes
HDT	1964, week 28 — AC50 1311 (small-box twin channel), 1727, 1852	Vox AC50 — Hunts capacitor date codes
IYT	1964, week 30 — AC100 s/n 392, spent cathode-bypass caps; the page decodes week 30, year letter T = 1964	www.voxac100.org.uk
IST	1964, week 35 — AC50 1502	Vox AC50 — Hunts capacitor date codes
INT	1964, week 37 — AC50 1852	Vox AC50 — Hunts capacitor date codes
TWT	1964, week 41 — AC50 2644, 3615	Vox AC50 — Hunts capacitor date codes
THT	1964, week 42 — AC50 2620	Vox AC50 — Hunts capacitor date codes
TIT	1964, week 43 — AC50 2069 and two solid-state rectified units	Vox AC50 — Hunts capacitor date codes
TTT	1964, week 44 — AC50 - the page prints '?TT = probably TTT'	Vox AC50 — Hunts capacitor date codes
TST	1964, week 45 — AC50 4282 and an early solid-state rectified unit	Vox AC50 — Hunts capacitor date codes
TDT	1964, week 48 — AC50, solid-state rectified, early	Vox AC50 — Hunts capacitor date codes
TAT	1964, week 49 — AC50 3680 - latest 1964 code recorded	Vox AC50 — Hunts capacitor date codes
YUS	1965, week 06 — AC50 4282	Vox AC50 — Hunts capacitor date codes
YNS	1965, week 07 — AC50 3709 - earliest 1965 code recorded	Vox AC50 — Hunts capacitor date codes
HUS	1965, week 26 — AC100 1367, blue Hunts 16 uF	www.voxac100.org.uk
IUS	1965, week 36 — AC100 1367, preamp filter cap	www.voxac100.org.uk
UYT	1966, week 04 — AC100 1367 and the 1900s-serial AC100s (from no. 1905): 'stocks evidently lasted some time'	www.voxac100.org.uk
D YW	1968, week 01 — printed with a space; year first: 8 01 = first week of 1968	Vox AC50 — Hunts capacitor date codes
SS	1965 — printed '?SS' - the page reads it as 'probably 5th or 15th week of 1965'; ambiguous, first letter unreadable	Vox AC50 — Hunts capacitor date codes

Audio Research — Hunts capacitor date code (WHITSUNDAY)

1950s-1969 (Hunts taken over by Erie in the late 1960s, probably 1969) · 25 rows · confidence Medium · Vox AC50 — Hunts capacitor date codes

Code as marked	Meaning	Source
YIW	1961, week 03 — AC50 s/n 1034B: week first (03), year last digit 1 -> 1961	Vox AC50 — Hunts capacitor date codes
WAI	1963, week 19 — same unit 1034B, second cap	Vox AC50 — Hunts capacitor date codes
ITD	1963, week 48 — reverse order (year letter first): 3 48 -> 1963 week 48; the page calls it out as an exception	Vox AC50 — Hunts capacitor date codes
WST	1964, week 15 — AC50 1411 / 1524 / 1678 (x2) - the most common code in large-box AC50s	Vox AC50 — Hunts capacitor date codes
HWT	1964, week 21 — AC50 1411, bias circuit cap	Vox AC50 — Hunts capacitor date codes
HUT	1964, week 26 — AC50 1786 and 1876	Vox AC50 — Hunts capacitor date codes
HNT	1964, week 27 — AC50 1727; probably also the '?NT' codes on 2031 and on an Australian unit	Vox AC50 — Hunts capacitor date codes
HDT	1964, week 28 — AC50 1311 (small-box twin channel), 1727, 1852	Vox AC50 — Hunts capacitor date codes
IYT	1964, week 30 — AC100 s/n 392, spent cathode-bypass caps; the page decodes week 30, year letter T = 1964	www.voxac100.org.uk
IST	1964, week 35 — AC50 1502	Vox AC50 — Hunts capacitor date codes
INT	1964, week 37 — AC50 1852	Vox AC50 — Hunts capacitor date codes
TWT	1964, week 41 — AC50 2644, 3615	Vox AC50 — Hunts capacitor date codes
THT	1964, week 42 — AC50 2620	Vox AC50 — Hunts capacitor date codes
TIT	1964, week 43 — AC50 2069 and two solid-state rectified units	Vox AC50 — Hunts capacitor date codes
TTT	1964, week 44 — AC50 - the page prints '?TT = probably TTT'	Vox AC50 — Hunts capacitor date codes
TST	1964, week 45 — AC50 4282 and an early solid-state rectified unit	Vox AC50 — Hunts capacitor date codes
TDT	1964, week 48 — AC50, solid-state rectified, early	Vox AC50 — Hunts capacitor date codes
TAT	1964, week 49 — AC50 3680 - latest 1964 code recorded	Vox AC50 — Hunts capacitor date codes
YUS	1965, week 06 — AC50 4282	Vox AC50 — Hunts capacitor date codes
YNS	1965, week 07 — AC50 3709 - earliest 1965 code recorded	Vox AC50 — Hunts capacitor date codes
HUS	1965, week 26 — AC100 1367, blue Hunts 16 uF	www.voxac100.org.uk
IUS	1965, week 36 — AC100 1367, preamp filter cap	www.voxac100.org.uk
UYT	1966, week 04 — AC100 1367 and the 1900s-serial AC100s (from no. 1905): 'stocks evidently lasted some time'	www.voxac100.org.uk
D YW	1968, week 01 — printed with a space; year first: 8 01 = first week of 1968	Vox AC50 — Hunts capacitor date codes
SS	1965 — printed '?SS' - the page reads it as 'probably 5th or 15th week of 1965'; ambiguous, first letter unreadable	Vox AC50 — Hunts capacitor date codes

J.E. Sugden & Sons — Hunts capacitor date code (WHITSUNDAY)

1950s-1969 (Hunts taken over by Erie in the late 1960s, probably 1969) · 25 rows · confidence Medium · Vox AC50 — Hunts capacitor date codes

Code as marked	Meaning	Source
YIW	1961, week 03 — AC50 s/n 1034B: week first (03), year last digit 1 -> 1961	Vox AC50 — Hunts capacitor date codes
WAI	1963, week 19 — same unit 1034B, second cap	Vox AC50 — Hunts capacitor date codes
ITD	1963, week 48 — reverse order (year letter first): 3 48 -> 1963 week 48; the page calls it out as an exception	Vox AC50 — Hunts capacitor date codes
WST	1964, week 15 — AC50 1411 / 1524 / 1678 (x2) - the most common code in large-box AC50s	Vox AC50 — Hunts capacitor date codes
HWT	1964, week 21 — AC50 1411, bias circuit cap	Vox AC50 — Hunts capacitor date codes
HUT	1964, week 26 — AC50 1786 and 1876	Vox AC50 — Hunts capacitor date codes
HNT	1964, week 27 — AC50 1727; probably also the '?NT' codes on 2031 and on an Australian unit	Vox AC50 — Hunts capacitor date codes
HDT	1964, week 28 — AC50 1311 (small-box twin channel), 1727, 1852	Vox AC50 — Hunts capacitor date codes
IYT	1964, week 30 — AC100 s/n 392, spent cathode-bypass caps; the page decodes week 30, year letter T = 1964	www.voxac100.org.uk
IST	1964, week 35 — AC50 1502	Vox AC50 — Hunts capacitor date codes
INT	1964, week 37 — AC50 1852	Vox AC50 — Hunts capacitor date codes
TWT	1964, week 41 — AC50 2644, 3615	Vox AC50 — Hunts capacitor date codes
THT	1964, week 42 — AC50 2620	Vox AC50 — Hunts capacitor date codes
TIT	1964, week 43 — AC50 2069 and two solid-state rectified units	Vox AC50 — Hunts capacitor date codes
TTT	1964, week 44 — AC50 - the page prints '?TT = probably TTT'	Vox AC50 — Hunts capacitor date codes
TST	1964, week 45 — AC50 4282 and an early solid-state rectified unit	Vox AC50 — Hunts capacitor date codes
TDT	1964, week 48 — AC50, solid-state rectified, early	Vox AC50 — Hunts capacitor date codes
TAT	1964, week 49 — AC50 3680 - latest 1964 code recorded	Vox AC50 — Hunts capacitor date codes
YUS	1965, week 06 — AC50 4282	Vox AC50 — Hunts capacitor date codes
YNS	1965, week 07 — AC50 3709 - earliest 1965 code recorded	Vox AC50 — Hunts capacitor date codes
HUS	1965, week 26 — AC100 1367, blue Hunts 16 uF	www.voxac100.org.uk
IUS	1965, week 36 — AC100 1367, preamp filter cap	www.voxac100.org.uk
UYT	1966, week 04 — AC100 1367 and the 1900s-serial AC100s (from no. 1905): 'stocks evidently lasted some time'	www.voxac100.org.uk
D YW	1968, week 01 — printed with a space; year first: 8 01 = first week of 1968	Vox AC50 — Hunts capacitor date codes
SS	1965 — printed '?SS' - the page reads it as 'probably 5th or 15th week of 1965'; ambiguous, first letter unreadable	Vox AC50 — Hunts capacitor date codes

Musical Fidelity — Hunts capacitor date code (WHITSUNDAY)

1950s-1969 (Hunts taken over by Erie in the late 1960s, probably 1969) · 25 rows · confidence Medium · Vox AC50 — Hunts capacitor date codes

Code as marked	Meaning	Source
YIW	1961, week 03 — AC50 s/n 1034B: week first (03), year last digit 1 -> 1961	Vox AC50 — Hunts capacitor date codes
WAI	1963, week 19 — same unit 1034B, second cap	Vox AC50 — Hunts capacitor date codes
ITD	1963, week 48 — reverse order (year letter first): 3 48 -> 1963 week 48; the page calls it out as an exception	Vox AC50 — Hunts capacitor date codes
WST	1964, week 15 — AC50 1411 / 1524 / 1678 (x2) - the most common code in large-box AC50s	Vox AC50 — Hunts capacitor date codes
HWT	1964, week 21 — AC50 1411, bias circuit cap	Vox AC50 — Hunts capacitor date codes
HUT	1964, week 26 — AC50 1786 and 1876	Vox AC50 — Hunts capacitor date codes
HNT	1964, week 27 — AC50 1727; probably also the '?NT' codes on 2031 and on an Australian unit	Vox AC50 — Hunts capacitor date codes
HDT	1964, week 28 — AC50 1311 (small-box twin channel), 1727, 1852	Vox AC50 — Hunts capacitor date codes
IYT	1964, week 30 — AC100 s/n 392, spent cathode-bypass caps; the page decodes week 30, year letter T = 1964	www.voxac100.org.uk
IST	1964, week 35 — AC50 1502	Vox AC50 — Hunts capacitor date codes
INT	1964, week 37 — AC50 1852	Vox AC50 — Hunts capacitor date codes
TWT	1964, week 41 — AC50 2644, 3615	Vox AC50 — Hunts capacitor date codes
THT	1964, week 42 — AC50 2620	Vox AC50 — Hunts capacitor date codes
TIT	1964, week 43 — AC50 2069 and two solid-state rectified units	Vox AC50 — Hunts capacitor date codes
TTT	1964, week 44 — AC50 - the page prints '?TT = probably TTT'	Vox AC50 — Hunts capacitor date codes
TST	1964, week 45 — AC50 4282 and an early solid-state rectified unit	Vox AC50 — Hunts capacitor date codes
TDT	1964, week 48 — AC50, solid-state rectified, early	Vox AC50 — Hunts capacitor date codes
TAT	1964, week 49 — AC50 3680 - latest 1964 code recorded	Vox AC50 — Hunts capacitor date codes
YUS	1965, week 06 — AC50 4282	Vox AC50 — Hunts capacitor date codes
YNS	1965, week 07 — AC50 3709 - earliest 1965 code recorded	Vox AC50 — Hunts capacitor date codes
HUS	1965, week 26 — AC100 1367, blue Hunts 16 uF	www.voxac100.org.uk
IUS	1965, week 36 — AC100 1367, preamp filter cap	www.voxac100.org.uk
UYT	1966, week 04 — AC100 1367 and the 1900s-serial AC100s (from no. 1905): 'stocks evidently lasted some time'	www.voxac100.org.uk
D YW	1968, week 01 — printed with a space; year first: 8 01 = first week of 1968	Vox AC50 — Hunts capacitor date codes
SS	1965 — printed '?SS' - the page reads it as 'probably 5th or 15th week of 1965'; ambiguous, first letter unreadable	Vox AC50 — Hunts capacitor date codes

Frequently asked

What does a Hunts code like YIW mean?

Read on the WHITSUNDAY alphabet: Y=0 as the year digit and IW as week 19 would be the reverse reading, while the documented reading is week 03 (YI) and year digit 1 — 1961, in an amplifier of that era. Both readings are checked, and the amplifier's own era fixes the decade.

Can I date an amplifier from a capacitor alone?

You can date the capacitor. The amplifier is never older than its newest original part, so the code marks the earliest the unit can be, not the year it was built.

Open a maker and enter your code →