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