Newer speaker dating codes dev patel dating
Here is a cool link to a Vintage Fender Amp price history chart that tracks sales data for specific amp models by the month.
Date Code: Wide panel, narrow panel, brown, blonde, and black face amps have a date code hand-stamped on the tube chart. The first letter translates to the year and the second to the month. Example: FG=July 1956, QA=January 1967, and a reissue CG=July 1992 EIA Source-Date Codes: Electronic components such as transformers, potentiometers, speakers, and some capacitors are often stampted with a date code indicating who manufactured them and when.
Amplifiers with a serial starting with "AB" were made by Audio Brothers in England the 1990s.
Amplifiers with a serial starting with a single letter and bearing a plate which has "HIWATT UK" and LONDON or DONCASTER on it were made starting in the early 2000s by the current Hiwatt manufacturers, Music Ground.
Note that other firms (as well as the crew in-house) did some wiring for Hiwatt at various times throught the company history, because Joyce would only produce a limited amount of chassis each month (20...40; accounts vary).
An important item to remember is that the date that the wiring crew put on the amplifiers was the date that they completed wiring the chassis for Hiwatt, not the date of final manufacture of that unit.
These circuit numbers which are located on the tube chart can be usefull for getting a rough date on an amp.Please note also that the speaker cabinet serial numbers used a different progression.Please browse the Registry page for more specific data relating serial numbers to dates.Note: The numbers below are for Hylight and Biacrown Hiwatt amplifiers only!Any serial number that begins with one or more letters was made in the 90s or later, and is not included in this list.