Did Radford publish serial tables?

No; the STA-25's 1964–1971 run comes from a specialist archive and the rest is undated here.

How do I tell Radford series apart?

Valve complement, boards, wiring and markings checked together — and the 2011/2013 reissue company builds to the original 1964 drawings, so reissues must not be merged with originals.

The maker's archive

Radford Electronics hi-fi.

Radford published no serial tables and the surviving material is thin: the model years (STA-15, STA-25 from 1964 to 1971) come from period advertising. Everything not confirmed by an era advertisement or catalogue stays in the archive simply unconfirmed.

Country: UK
Active since
Coverage: 1960–2023 · 17 code systems
Dating tier: No serial table
In the archive: 0 series · 17 code systems · 4 models
Years documented: 1960–2023

What dates this maker

Model year from period advertising — STA-25 1964–1971, 4× EL34, EF86, ECF82 construction.
Component date codes on the parts where they can be reached.
Cosmetics of the chassis and transformer covers.

Watch out

Radford did not publish a serial table and no community reconstruction is documented: no year can be read out of a Radford number.

Radford STA25 Series 1/2/3: circuit differences as the version tellSTA25 introduced 1962; period advertisements place the STA-25 in 1964-1971 · 5 rows · Medium confidence

Radford has no serial chart and no serial rule1950s-1970s; revival 2011 · 3 rows · Medium confidence

Radford / valve amplifier safety noteall valve units · 1 rows · High confidence

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

British year-letter date codes (TCC, Dubilier, Radiospares, Woden, Welwyn)1950s-1960s · 4 rows · Medium confidence

Mullard 'mustard' capacitor date codelate 1963 onwards (used occasionally in late 1963, more frequently from mid 1964) · 3 rows · Medium confidence

Egen potentiometer date code1960-1964 (year letters documented by the source) · 2 rows · Medium confidence

EIA component source/date codeswhole vintage period · 1 rows · High confidence

Safety warnings that apply to any vintage valve hi-fiwhole vintage period · 4 rows · High confidence

Japanese electrolytic capacitor date codes - the shared YYWW mechanicdocumented samples 1993-2023; no maker states when a format started or ended · 0 rows · Medium confidence

Nippon Chemi-Con date code (year digit + bracketed character)2000s production (the repair page was published November 2005) · 2 rows · Low confidence

Nichicon date code (plant letter + YYWW)1990s-2010s (documented 1993 and 2013 samples, same format) · 4 rows · Medium confidence

ELNA date code (four digits, YYWW)1990s-2000s (documented 2000 and 2003 samples) · 2 rows · Medium confidence

Rubycon date code (plant letter + YYWW)1990s-2000s (documented 2002 and 2008 samples) · 3 rows · Medium confidence

Matsushita / Panasonic lot-code date (xYMD), SMD parts2020s SMD parts (documented example decoded as April 2023) · 1 rows · Low confidence

Nichicon month letters J-Z (official notice, power capacitors and reactors)2004 production numbers; the notice itself is dated 2022-04-01 · 4 rows · High confidence

Class A heat, bias and the dating trap - safety notes for this wavewhole Class A vintage period (1967-present) · 3 rows · High confidence

4 Radford Electronics models are catalogued with their production years, specs and safety notes.