Is there an Accuphase serial lookup?

No public one: the serial exists for the factory's own service. The official product museum — every model with the year and month it went on sale — is what dates these units.

How precise is the Accuphase product museum?

To the month of introduction per model — the E-202, for example, is May 1974.

What is the Kensonic period?

Early Accuphase units carry the Kensonic name; the archive keys on it as an era marker.

The maker's archive

Accuphase Laboratory hi-fi.

Accuphase was founded in 1972 by Kenwood's former engineering leadership, and it has built one signature idea ever since: pure Class A amplification at the top of the market. The maker publishes an official product museum — every model with the year and month it went on sale — which makes its model lineage the best-documented in this archive.

Country: Japan
Active since: 1972
Coverage: 1960–2023 · 19 code systems
Dating tier: Codes only
In the archive: 0 series · 19 code systems · 16 models
Years documented: 1960–2023

What dates this maker

No serial-to-year table exists or has ever been published; the serial number exists for the factory's own service records.
The official product museum: model by model, the year and month of introduction — the anchor of every Accuphase reading here.
Japanese capacitor date codes and the era markers (the Kensonic period, line successions) narrow a unit further.

Watch out

A serial number on an Accuphase carries no public calendar: any year read straight off the number is invented.
The E-202 of the museum is the month it went on sale, not the month your unit was assembled.

Kensonic Laboratory to Accuphase Laboratory - company eras, not brand eras1972-1982 (company name) against 1972-present (brand) · 4 rows · High confidence

Accuphase model prefix as an era and function marker1973-2000s (first use of each prefix, from the official product museum) · 9 rows · High confidence

Suffix generations inside an Accuphase family (S, X, L, V)1973-2000 (documented successions in the official museum table) · 16 rows · High confidence

Accuphase official reference (product museum; no serial service)1972-present · 3 rows · High confidence

Japanese capacitor date codes - pointer to the universal layerwhole vintage period · 0 rows · Medium 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

16 Accuphase Laboratory models are catalogued with their production years, specs and safety notes.