FENDER DATE CODES Date Code: Most Fender Wide Panel Tweed, Narrow Panel Tweed, Brown, Blonde, and Blackface amps will have a date code hand-stamped on the tube chart and sometimes on the chassis as well. This date code consists of two letters. The first letter indicates the year and the second the month of manufacture. Most reissue Fender amps also use this same code. Date Codes Letter Code Vintage Year Reissue Year Month A – 1990 January B – 1991 February C 1953 1992 March D 1954 1993 April E 1955 1994 May F 1956 1995 June G 1957 1996 July H 1958 1997 August I 1959 1998 September J 1960 1999 October K 1961 – November L 1962 – December M 1963 – – N 1964 – – O 1965 – – P 1966 – – Q 1967 – – For Example: FH = August 1956, NA = January 1964, and a reissue CF = June 1992 DATING FENDER TRANSFORMERS, SPEAKERS & POTENTIOMETERS USING EIA CODES EIA (Electronics Industry Association) Source-Date Codes: Electronic components such as transformers, potentiometers, speakers, and some capacitors are often stamped with a date code, which indicates the manufacturer and the manufacturing date. The code follows the format: XXXYYZZ, where: XXX = a two or three digit number (possibly four on newer amps) indicating the manufacturer. (refer to the chart shown below) YY = is a one or two digit code indicating the year of manufacture. If it's a one-digit number you need to determine the correct decade of the amp some other way. ZZ = a number from 1 - 52 indicating the week of manufacture. Remember, your amp is newer than the newest component. For example, if you find pots from late ‘64 and transformers from early ’65, you can be pretty sure your amp is a 1965. COMMONLY USED FENDER EIA SOURCE CODES Common Fender Source Codes Code Manufacturer Part(s) 67 Eminence Speakers 73 J.B. Lansing (JBL) Speakers 137 CTS Potentiometers, Speakers 220 Jensen Speakers 235 Mallory Capacitors 285 Rola Speakers 304 Stackpole Potentiometers 328 Utah Speakers 391 Altec-Lansing Speakers 433 Cleveland Speakers 465 Oxford Speakers 606 Schumacher Transformers, Chokes 649 Electro Voice (EV) Speakers 830 Triad Transformers, Chokes 1098 Pyle Speakers For example: a transformer code of 606432, in a Blackface era Fender amp (1960’s), would be Schumacher (606), manufactured in 1964 (4) in the 32nd week (32) Another example: a speaker code of 220820, in a Tweed era Fender amp (1950’s – early 1960’s), would be Jensen (220), manufactured in 1958 (8) in the 20th week (20) VINTAGE FENDER TRANSFORMER USAGE CHART The following chart, was originally printed in VG magazine, by Gerald Weber. If you see any data that is not listed here or notice any errors, for 1970’s and earlier Fender amps, please send us an email and we will update the chart. Fender Transformer Wiring Diagrams Model Name Model Power Output Choke Reverb Bandmaster 6G7A 67233 45217 125C1A * AA763 125P7D 125A6A 125C1A * AC568 125P7D 125A6A 125C1A * Bandmaster Reverb AA270 125P5D 125A6A 125C1A 022921 AA768 125P5D 125A6A 125C1A 022921 AA1069 125P5D 125A6A 125C1A 022921 Bassman 4 x 10 combo’s and Heads 5F6 8087 45249 14684 * 5F6A 8087 45249 14684 * 6G6 125P5A 125A5A 125C1A * 6G6A 125P7A 125A13A 125C1A * AA270 125P7D 125A13A 125C1A * AA864 125P7D 125A13A 125C1A * AB165 125P7D 125A13A 125C1A * AC568 125P7D 125A13A 125C1A * Bassman 70   013897 013897 * * Bassman 135   01692 013691 * * Champ AA764 125P1B 125A35A * * Concert 6G12 67233 45249 125C1A * AB763 125P7D 125A9A 125C1A * Deluxe and Deluxe Reverb 6G3 125P2A 125A1A * * AA763 125P23B 125A1A 125C3A 022921 AB868 125P23B 125A1A 125C3A 022921 Model Name Model Power Output Choke Reverb Harvard 6G10 125P1A 125A2A * * Princeton and Princeton Reverb 5F2A 66079 265 * * AA1164 125P1B 125A10B * 022921 B1270 125P1B 125A20B * 022921 Pro and Pro Reverb 5C5 6516 1846 * * 5D5 6516 1846 * * 5E5A 6516 1846 * * 6G5A 125P7D 125A7A 125C1A * AB763 125P5D 125A7A 125C1A 022921 AA270 125P5D 125A6A 125C1A 022921 AA1069 125P5D 125A6A 125C1A 022921 Reverb Unit 6G15 68319 * 125C3A 125A12A 6G15 125P24A * 125C3A 125A12A Showman 6G14 67233 45550 125C1A * AA763 125P34A 125A30A 125C1A * Dual Showman AB763 125P34A 125A29A 125C1A * Super and Super reverb 6G4 8087 45216 125C1A * 6G4A 125P7A 125A6A 125C1A * AB563 125P5D 125A9A 125C1A 022921 AA763 125P5D 125A9A 125C1A 022921 AB763 125P5D 125A9A 125C1A 022921 AA270 125P5D 125A9A 125C1A 022921 Tremolux 5G9 8160 108 14684 * 6G9 125P6A 45217 125C1A * 6G9A 125P6A 45217 125C1A * 6G9B 68409 125A6A 125C3A * AB763 125P26A 125A6A 125C3A 022921 Model Name Model Power Output Choke Reverb Twin and Twin Reverb 5G8A 7993 45268 14684 * 6G8 67233 45548 125C1A * AB763 125P34A 125A29A 125C1A 022921 AC568 125P34A 125A29A 125C1A 022921 AA769 125P34A 125A29A 125C1A 022921 AA270 125P34A 125A29A 125C1A 022921 Twin Reverb 7591 Tubes AB763 125P19A 125A18A 125C1A 022921 Vibrolux and Vibrolux Reverb 6G11 125P6A 45217 125C3A * 6G11A 68409 125A7A 125C3A * AB763 125P26A 125A7A 125C3A 022921 AA965 125P26A 125A6A 125C3A 022921 AB568 125P26A 125A6A 125C3A 022921 Vibroverb 6G16 125P6A 45217 125C1A 022921 AA763 125P5D 125A7A 125C1A 022921 NOTE: * denotes no transformer used FENDER TRANSFORMER NUMBER CONVERSION CHART 125A1A ––> 022640     125A6A ––> 022848 ––> 036968 125A7A ––> 236968 ––> 018343 125A9A ––> 022855     125A10B ––> 022913     125A12A ––> 022990     125A13A ––> 022871 ––> 018343 125A20A ––> 022921     125A29A ––> 022899     125A30A ––> 022897     125A35A ––> 022905     125C1A ––> 022699     125C3A ––> 022707     125P1B ––> 022772     125P5D ––> 022798     125P6A ––> 036486 ––> 036483 125P7D ––> 022814     125P23B ––> 025130     125P24A ––> 012671     125P26A ––> 022723 ––> 036483 125P31A ––> 022731     125P34A ––> 022756