Dating Your Fender Amp

How the "Hand Stamped" Date Code Works. The Code on the tube chart of your Fender Amp is made up of two letters. The First letter equates to the Year and the Second letter to the Month. Reissue amps also use stamped Date Codes.
Examples of "Hand Stamped" Date Codes.

QA=Jan 1967
CG=Jul 1992 "Reissue"

FENDER AMP Chassis Serial Number DATE CODES

http://www.superiormusic.com/page195.htm

Bandmaster 5C7, 5D7 (tweed) 0001 to 0800 - 1953 5000 to 5500 - 1954 Bandmaster 5E7 (tweed) S00001 to S00350 - 1955 S00350 to S01200 - 1956 S01100 to S01800 - 1957 S01700 to S02500 - 1958 S02500 to S03700 - 1959 Bandmaster 5G7, 6G7 (brown) 00001 to 01000 - 1960 Bandmaster 6G7, 6G7-A (blonde) 00001 to 02400 - 1960 02300 to 05100 - 1961 49000 to 58000 - 1962 58000 to 59200 - 1963 Bandmaster AA763, AB763 (blackface) A00001 to A01700 - 1963 A01400 to A08000 - 1964 A07700 to A17000 - 1965 A16000 to A22000 - 1966 A20000 to A27000 - 1967 Bandmaster AB763, AC568 (silverface) A26000 to A29000 - 1967 A28000 to A34000 - 1968 A33000 to A34000 - 1969 A34000 to A45000 - 1970-72 Bandmaster Reverb AA768, AA1069, AA270, TFL5005 (silverface) A31000 to A35000 - 1968 A35000 to A45000 - 1969 A45000 to A49000 - 1970 A48000 to A54000 - 1971 A54000 to A59000 - 1972 A59000 to A66000 - 1973 A66000 to A77000 - 1974 A75000 to A78000 - 1975 A78000 to A80000 - 1976 Bassman 5B6 (tweed) 0001 to 0300 - 1951 0300 to 0400 - 1952 0400 to 0600 - 1953 Bassman 5D6, 5D6-A (tweed) 0600 to 0900 - 1954 Bassman 5E6, 5E6-A (tweed) 0100 to 0200 - 1955 BM00001 to BM00550 - 1955 BM00550 to BM01200 - 1956 BM01200 to BM01600 - 1957 Bassman 5F6, 5F6-A (tweed) BM00001 to BM00400 - 1957 BM00400 to BM01500 - 1958 BM01500 to BM03100 - 1959 BM03100 to BM04600 - 1960 Bassman 6G6, 6G6-A, 6G6-B (blonde) BP00100 to BP01100 - 1961 BP01100 to BP05000 - 1962 BP05000 to BP08400 - 1963 BP08400 to BP12000 - 1964 Bassman AA864, AA165, AB165 (blackface) A00100 to A03800 - 1964 A03800 to A15000 - 1965 A15000 to A25000 - 1966 A24000 to A33000 - 1967 Bassman AB165, AC568, AA270,  AA371 (silverface) A32000 to A40000 - 1967 A39000 to A49000 - 1968 A48000 to A58000 - 1969 A58000 to A60000 - 1970 Bronco AB764 (silverface) A19000 to A21000 - 1967 A20000 to A26000 - 1968 A25000 to A28000 - 1969 A28000 to A29000 - 1970 A29000 to A32000 - 1971 A32000 to A35000 - 1972 A33000 to A39000 - 1973 A39000 to A42000 - 1974 A42000 to A51000 - 1975 Champion 800 (tweed) 01 to 1000 - 1948-49 Champion 600 5B1 (tweed) 01 to 1300 - 1948-49 1300 to 1700 - 1950 1700 to 5000 - 1951-52 5000 to 5500 - 1953 Champ 5C1, 5D1 (tweed) 5500 to 6600 - 1953 6600 to 8000 - 1954 8000 to 9999 - 1955 Champ 5E1, 5F1 (tweed) C00001 to C00800 - 1955 C00800 to C03100 - 1956 C03100 to C06000 - 1957 C06000 to C08800 - 1958 C08800 to C12500 - 1959 C12500 to C15500 - 1960 C15500 to C16800 - 1961 C17000 to C19000 - 1962 C19000 to C21000 - 1963 C21000 to C23000 - 1964 Champ AA764 (blackface) A00100 to A02000 - 1964 A01900 to A05200 - 1965 A05200 to A12000 - 1966 A12000 to A12200 - 1967 Champ AA764 (silverface) A12200 to A13900 - 1968 A13900 to A18000 - 1969 A18000 to A30500 - 1970 A30500 to A32000 - 1971 A32000 to A35000 - 1972 A32000 to A42000 - 1973 A42000 to A50000 - 1974 A50000 to A63000 - 1975 A63000 to A85000 - 1976 Concert 5G12, 6G12, 6G12-A (brown) 00001 to 02400 - 1960 02300 to 05100 - 1961 49000 to 58000 - 1962 58000 to 59200 - 1963 Concert AA763, AB763 (blackface) A00001 to A01700 - 1963 A01400 to A08000 - 1964 A07700 to A08800 - 1965 Deluxe Model 26 (woody) 100 to 1500 - 1946-48 Deluxe 5A3, 5B3 (tweed) 001 to 800 - 1948 800 to 1900 - 1949 1900 to 3000 - 1950 3000 to 5400 - 1951 5400 to 6800 - 1952 6800 to 7300 - 1953 Deluxe 5C3, 5D3 (tweed) 0001 to 1500 - 1953 1500 to 3600 - 1954 3600 to 5300 - 1955 Deluxe 5E3 (tweed) D00001 to D01400 - 1955 D01400 to D03000 - 1956 D03000 to D05000 - 1957 D05000 to D06800 - 1958 D06800 to D09000 - 1959 D09000 to D10000 - 1960 D10000 to D11000 - 1961 Deluxe 6G3, 6G3-A (brown) D00100 to D00900 - 1961 D00800 to D03800 - 1962 D03800 to D04900 - 1963 Deluxe AA763, AB763 (blackface) A00100 to A00500 - 1963 A00500 to A02800 - 1964 A02800 to A05600 - 1965 A05600 to A06100 - 1966 A06100 to A06500 - 1967 Deluxe Reverb AA763, AB763 (blackface) A00100 to A00300 - 1963 A00300 to A03900 - 1964 A03900 to A13000 - 1965 A12000 to A19000 - 1966 A19000 to A24000 - 1967 Deluxe Reverb AB763, AB868 (silverface) A24000 to A26000 - 1967 A26000 to A28500 - 1968 A28500 to A33000 - 1969 A31000 to A33000 - 1970 A33000 to A34500 - 1971 A34500 to A37000 - 1972 A37000 to A39000 - 1973 A39000 to A42000 - 1974 A42000 to A43000 - 1975 A43000 to A45000 - 1976 Dual Showman AA763, AB763 (blackface) A00100 to A01400 - 1963 A01400 to A01700 - 1964 A01700 to A04300 - 1965 A04300 to A08000 - 1966 A07800 to A12000 - 1967 Dual Showman AB763, AC568 (silverface) A12000 to A12500 - 1967 A12500 to A15000 - 1968 Dual Showman Reverb AA768, AA769, AA270, TFL5000 (silverface) A13900 to A16500 - 1968 A16500 to A22400 - 1969 A21700 to A25600 - 1970 A25600 to A37000 - 1971 A37000 to A50500 - 1972 A50500 to A68000 - 1973 A68000 to A99999 - 1974 A81000 to A99999 - 1975 B01000 to B15000 - 1975 B15000 to B68000 - 1976 Harvard 5F10 (tweed) H00100 to H00500 - 1956 H00500 to H01400 - 1957 H01400 to H02000 - 1958 H02000 to H02600 - 1959 H02600 to H03400 - 1960 H03400 to H03500 - 1961 Musicmaster Bass CFA-7010 (silverface) A00100 to A04100 - 1972 A04100 to A07900 - 1973 A07900 to A09500 - 1974 A09500 to A09800 - 1975 A09800 to A10500 - 1976 Princeton 5B2, 5C2, 5D2 (tweed) 2500 to 3600 - 1953 3600 to 4400 - 1954 4400 to 4700 - 1955 Princeton 5F2, 5F2-A (tweed) P0001 to P00350 - 1955 P0001 to P01100 - 1956 P01100 to P02400 - 1957 P02400 to P03000 - 1958 P03000 to P04300 - 1959 P04300 to P07000 - 1960 Princeton 6G2, 6G2-A (brown) P00100 to P01000 - 1961 P01000 to P05100 - 1962 P05100 to P07200 - 1963 P07100 to P09900 - 1964 Princeton AA964 (blackface) A00100 to A02500 - 1964 A02500 to A07000 - 1965 A05000 to A10400 - 1966 Princeton AA964 (silverface) A10000 to A11000 - 1967-68 A11000 to A15000 - 1969-70

Princeton Reverb AA1164 (blackface) A00100 to A02100 - 1964 A02100 to A07500 - 1965 A05500 to A14500 - 1966 A14000 to A18700 - 1967 Princeton Reverb AA1164, B1270 (silverface) A18500 to A19500 - 1967 A18900 to A21500 - 1968 A21500 to A25500 - 1969 A24000 to A25000 - 1970 A25000 to A26000 - 1971 A26000 to A27500 - 1972 A27500 to A30000 - 1973 A30000 to A32500 - 1974 A32500 to A34500 - 1975 A34500 to A36000 - 1976 Pro 5A5, 5B5, 5C5, 5D5 (tweed) 01 to 600 - 1948 600 to 1100 - 1949 1100 to 1700 - 1950 1700 to 2500 - 1951 2500 to 3500 - 1952 3500 to 4800 - 1953 4500 to 6000 - 1954 Pro 5E5, 5E5-A, 5E5-B (tweed) S00100 to S00800 - 1955 S00800 to S01200 - 1956 S01200 to S01800 - 1957 S01700 to S02500 - 1958 S02500 to S03700 - 1959 Pro 5G5, 6G5, 6G5-A (brown) 00001 to 02400 - 1960 02300 to 05100 - 1961 49000 to 58000 - 1962 58000 to 59200 - 1963 Pro AA763, AB763 (blackface) A00001 to A01700 - 1963 A01400 to A08000 - 1964 Pro Reverb AA165 (blackface) A00100 to A02700 - 1965 A02700 to A09200 - 1966 A07000 to A10200 - 1967 Pro Reverb AA1265, AB668, AA1069, AA270 (silverface) A10000 to A10500 - 1967 A10500 to A12000 - 1968 A12000 to A13300 - 1969 A13400 to A14500 - 1970 A14500 to A15000 - 1971 A15000 to A15600 - 1972 A15600 to A17200 - 1973 A17200 to A19700 - 1974 A19700 to A20000 - 1975 A20000 to A21500 - 1976 Quad Reverb CFA7104 (silverface) A33000 to A37000 - 1971 A37000 to A50500 - 1972 A50500 to A68000 - 1973 A68000 to A99999 - 1974 A81000 to A99999 - 1975 B01000 to B15000 - 1975 B15000 to B68000 - 1976 Reverb Unit 6G15 (brown, blonde, blackface) R00100 to R00900 - 1961 R00900 to R02600 - 1962 R02600 to R04800 - 1963 R04800 to R07400 - 1964 R07400 to R09800 - 1965 R09800 to R11000 - 1966 Showman 6G14, 6G14-A (blonde) 00001 to 00350 - 1960 00200 to 00800 - 1961 00800 to 01500 - 1962 01500 to 01800 - 1963 Showman AA763, AB763 (blackface) A00100 to A01400 - 1963 A01400 to A01700 - 1964 A01700 to A04300 - 1965 A04300 to A08000 - 1966 A07800 to A12000 - 1967 Showman AB763 (silverface) A12000 to A12500 - 1967 A12500 to A15000 - 1968 Super incl. Dual Professional (tweed) 01 to 400 - 1946-47 500 to 1200 - 1949-51 2000 to 4300 - 1952-53 4500 to 5500 - 1954 5500 to 6100 - 1955 Super 5E4, 5F4 (tweed) S00100 to S00800 - 1955 S00800 to S01200 - 1956 S01200 to S01800 - 1957 S01700 to S02500 - 1958 S02500 to S03700 - 1959 Super 5G4, 6G4, 6G4-A (brown) 00001 to 02400 - 1960 02300 to 05100 - 1961 49000 to 58000 - 1962 58000 to 59200 - 1963 Super Reverb AA763, AB763 (blackface) A00100 to A00600 - 1963 A00600 to A06000 - 1964 A05900 to A13000 - 1965 A11000 to A20000 - 1966 A20000 to A27000 - 1967 Super Reverb AB763, AB568, AA1069, AA270 (silverface) A26000 to A29000 - 1967 A27000 to A35000 - 1968 A35000 to A45000 - 1969 A45000 to A49000 - 1970 A48000 to A54000 - 1971 A54000 to A59000 - 1972 A59000 to A66000 - 1973 A66000 to A77000 - 1974 A75000 to A78000 - 1975 A78000 to A80000 - 1976 Super Six Reverb CFA7106 (silverface) A33000 to A37000 - 1971 A37000 to A50500 - 1972 A50500 to A68000 - 1973 A68000 to A99999 - 1974 A81000 to A99999 - 1975 B01000 to B15000 - 1975 B15000 to B68000 - 1976 Tremolux 5E9, 5E9-A (tweed) 0001 to 00650 - 1955 00650 to 01000 - 1956 01000 to 01300 - 1957 01300 to 01700 - 1958 01700 to 02700 - 1959 02600 to 03300 - 1960 Tremolux 6G9, 6G9-A, 6G9-B (blonde) 00100 to 01000 - 1961 00900 to 04200 - 1962 04200 to 05900 - 1963 Tremolux AA763, AB763 (blackface) A00100 to A00500 - 1963 A00500 to A03700 - 1964 A03200 to A05700 - 1965 A05200 to A08000 - 1966 Twin 5C8, 5D8, 5D8-A, 5E8, 5E8-A (tweed) 001 to 500 - 1953-55 A00200 to A00725 - 1956-57 Twin 5F8, 5F8-A (tweed) A00010 to A00725 - 1957-59 Twin 6G8, 6G8-A (blonde) 00001 to 00100 - 1960 00100 to 00225 - 1961 00225 to 00400 - 1962 00400 to 00525 - 1963 Twin Reverb AA763, AB763 (blackface) A00100 to A01200 - 1964 A01200 to A04300 - 1965 A04300 to A07000 - 1966 A07000 to A10400 - 1967 Twin Reverb AB763, AC568, AA769, AA270 (silverface) A10500 to A11300 - 1967 A10500 to A16500 - 1968 A16500 to A21400 - 1969 A21400 to A25600 - 1970 0100 to 3400        - 1970 A25600 to A37000 - 1971 A37000 to A50500 - 1972 A50500 to A68000 - 1973 A68000 to A99999 - 1974 A81000 to A99999 - 1975 B01000 to B15000 - 1975 B15000 to B68000 - 1976 Vibrasonic 6G13, 6G13-A (brown) 00001 to 00350 - 1960 00200 to 00800 - 1961 00800 to 01500 - 1962 01500 to 01800 - 1963 Vibro Champ AA764 (blackface) A00100 to A02000 - 1964 A01200 to A08100 - 1965 A08100 to A16000 - 1966 A16000 to A20500 - 1967 Vibro Champ AA764 (silverface) A19000 to A21000 - 1967 A20000 to A26000 - 1968 A25000 to A28000 - 1969 A28000 to A29000 - 1970 A29000 to A32000 - 1971 A32000 to A35000 - 1972 A33000 to A39000 - 1973 A39000 to A42000 - 1974 A42000 to A51000 - 1975 A51000 to A53000 - 1976 Vibrolux 5F11 (tweed) F00001 to F00300 - 1956 F00300 to F00900 - 1957 F00900 to F01500 - 1958 F01500 to F02800 - 1959 F02800 to F04000 - 1960 F04100 to F04400 - 1961 Vibrolux 6G11, 6G11-A (brown) 00100 to 00700 - 1961 00700 to 03700 - 1962 03400 to 05500 - 1963 Vibrolux AA763 (blackface) A00100 to A01300 - 1964 Vibrolux Reverb AA864 (blackface) A00100 to A00800 - 1964 A00800 to A03600 - 1965 A03600 to A08300 - 1966 A08300 to A10700 - 1967 Vibrolux Reverb AA864, AA964, AB568, AA270 (silverface) A10700 to A11000 - 1967 A11000 to A12000 - 1968 A12000 to A13700 - 1969 A13700 to A23400 - 1970 A23400 to A24500 - 1971 A24500 to A25000 - 1972 A25000 to A27000 - 1973 A27000 to A31500 - 1974 A31500 to A33000 - 1975 A33000 to A34000 - 1976 Vibrosonic Reverb (silverface) A44000 to A50500 - 1972 A50500 to A68000 - 1973 A68000 to A99999 - 1974 A81000 to A99999 - 1975 B01000 to B15000 - 1975 B15000 to B68000 - 1976 Vibroverb 6G16 (brown) 00100 to 00600 - 1963 Vibroverb AA763, AB763 (blackface) A00100 to A05300 - 1964

 

Dating "Any" Amp

Common Potentiometer Source Codes

Code	Manufacturer
106	Allen-Bradley
134	CentraLab
137	CTS
140	Clarostat
304	Stackpole
381	Bourns Networks

Common Speaker Source Codes

Code	Manufacturer
67	Eminence
73	JB Lansing (JBL)
137	CTS
220	Jensen
308	Stromberg-Carlson
328	Utah
336	Western Electric
391	Altec-Lansing
416	Heath
465	Oxford
589	Bogen
649	Electro-Voice

Common Transformer Source Codes

Code	Manufacturer
606	Schumacher
830	Triad

How the Source-Date Code Works.

The source-date code on a pot is a 6 or 7 digit code impressed into the casing of the potentiometer. For speakers this code can be 5, 6, 7 or 8 digits long, and it's ink-stamped or paint-stamped on the "bell housing" of the speaker.

In either case, the code works the same. The first 3 digits on a pot, or the first 2, 3 or 4 digits on a speaker are the source or manufacturer code.

The remaining 3 or 4 digits are the date code. In 3 digit dates code, the 1st digit is the last digit of the year. On 4 digits date codes, the 1st and 2nd digits are the last two digits of the year. In either case, the remaining 2 digits are the week of manufacture (01 to 52). With this in mind, remember if the last two digits of the source-date code are greater than 52, you're not looking at the source-date code!

Also it's worth mentioning:

• Sometimes there is a space or hyphen between the manuafacturer code and the year/week code.
• 3 digit date codes were used in the 1940's and 1950's.
• 4 digit date codes were used in the 1960's and later (this makes determining the year much simplier!).
• On 3 digit date codes, you have to "guess" the decade of the pot or speaker. Usually this isn't too difficult.

 

Examples of Source-Date Codes.

With all this information in mind, can you identify the following manufacturer and date of these source-date codes?

 

220 7001

Jensen speaker, 1st week of 1970.

137341

CTS, 41st week of 1953 (or 1943 or 1963, but probably 1953 as source-date codes weren't used much during or before WWII, and 4 digit date codes weren't used till the 1960's and later).

304-6110

Stackpole pot, 10th week of 1961.

137848

CTS, 48th week or 1948 or 1958.

4656755

Not a source-date code. Can you see why? If you can't, read the above information again!

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Less Common Source Codes

Code	Manufacturer
24	Becker
101	Admiral
119	Automatic Mfg
125	Bendix
130	Panasonic
132	Talk-a-Phone
145	Consolidated
150	Crecent
169	Hitachi
185	Motorola
188	General Electric
213	Dearborn Wire
230	Littlefuse
232	Magnavox
235	Mallory (North American Capacitor)
245	National
251	Ohmite
252	Dukane
260	Philco
270	Quam-Nichols
274	RCA
277	Emerson
280	Raytheon
285	Rola
286	Ross
296	Solar
312	Sylvania
343	Zenith
371	Best
381	Bourns
394	Foster Transformer
433	Cleveland
449	Wilder
446	Delco
549	Midwest
575	Heppner
706	Pioneer
719	Carbonneau
742	Esquire
748	Russel
756	Universal
767	Quincy
787	Sonatone
789	McGregor
794	Harmon Kardon
795	Atlas
828	Midland
840	Ampex
847	University
918	Oaktron
1056	Fisher
1059	Channel
1098	Pyle
1113	Acoustic Fiber Sound
1149	Curtis Mathis
1191	Micro Magnet

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

DATING FENDER TUBE AMPS BY SERIAL NUMBER, PART 1
BY GREG GAGLIANO
COPYRIGHT 1997, 20TH CENTURY GUITAR MAGAZINE

and:

Your ultimate source for historical guitar amplifier information: THE AMP GUIDE