Third tube is the Normal channel preamp. See our for a guide and picture gallery of the known original speakers in the blackface and silverface amps. Most reissue Fender amps also use this same code. Many silverface and some blackface amps have the exact week, month and year stamped insie the chassis. Greg was passionate about Fender amps and his knowledge, insight and humor will be missed very much. This tube need not be low-noise or low-hum, nor does it need to be tested for microphony.
Second tube is the driver and vibrato tremolo modulator. Solid -state rectifiers do not wear out as tubes do, nor can they be replaced by the user. Bassman 6G6A, 6G6B These models are identical to the Bassman 6G6, except they models use solid-state rectifiers rather than tube rectifiers. Rectifier Semiconductors 845 University 847 Drake 851 Precision Grommes 871 Acro Products Acrosound 878 Litton Industries 879 Mohawk 883 Condensor Manufacturers 885 Connector Corp 888 American Transformer 892 Tresco 897 Coilcraft 906 Aerocoil 908 Oaktron 918 Todd Electric Co. Twin 6G8A; Showman 6G14A First tube is first channel preamp, 7025 is specified. You might damage the amplifier and the tubes. This is the driver stage and gain makeup stage.
Third tube is the reverb driver. The first of the three digits tells us the last digit of the year unfortunately not decade specific and the last two numbers tell us the week. The progress of this type of work is slow, hence the long hiatus, however, a lot of new data have been collected regarding Fender amplifiers, including production numbers. Fender often used the same circuit for many years so this is not a very accurate method for amp dating. Thanks to everyone who sent information about their amp s. Solid-state rectifiers do not wear out as tubes do, nor can they be replaced by the user. After 1968, most Fender tube amps switched to solid-state rectifiers, until recent Custom Shop models reintroduced tube rectifiers.
Paul Linden has volunteered to fill in for Greg. Eventually, the hope is to have enough info for a more detailed breakdown on the B series, A+6 digit and F+6 digit series. There are several ways to determine when a Fender amp was produced. Larger amps had two or four power tubes in push-pull, which work like a see-saw -- when one tube is decreasing in voltage, the other is increasing. Second tube is vibrato channel preamp, 7025 is specified. The following charts are the revised dating tables for Fender tube amps. It also provides guidelines to determine, generally, the age of a Hammond, based on certain features and characteristics that changed throughout the model history.
Solid-state rectifiers do not wear out as tubes do, nor can they be replaced by the user. Most post tweed Fenders had trannys manufactured by Schumacher. There are some easy ways to find out when your vintage Fender was manufactured. His passing is a great loss to this research team and the Fender amp aficionado community in general. There is lots of information here. Solid-state rectifiers do not wear out as tubes do, nor can they be replaced by the user.
Power tube middle socket is 6V6. Following is a list of manufacturers codes I've gleaned from a number of sources of the years. The First letter equates to the Year and the Second letter to the Month. This code is made up of two letters. First use the cosmetic features to get a range of possible years. Our explains in detail how you can date your amp by looking at serial numbers, tube charts, transformer codes, speaker codes, Fender logo, etc. 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 — — Common Fender Source Codes Code Manufacturer Part s 67 Eminence Speakers 73 J.
Fifth tube is the vibrato tremolo oscillator. Matched pairs are recommended to keep the amplifier balanced from side to side -- if you amp uses 4 or more output tubes, you can use groups of matched pairs, and you do not necessarily need to buy a matched quartet, sextet or octet. Second tube is second channel preamp, 7025 is specified. But other changes may be meant to deceive. For better or worse, this concept is common to this endeavor. Per Blue Book and Fender Consumer Relations Department. The revisions were made based on data collected since the tables were initially published.
Dairiki and the other authors of the content, whoever they may be. Fellow Fender amp researcher, Greg Huntington, passed away June 5, 2007 after losing his battle with cancer. This tube need not be low-noise or low-hum, nor does it need to be tested for microphony. Bias should be adjusted when tubes are replaced. Assuming they were all used sequentially and starting at 0100, there would be around 3700 non-master volume silverface Twin Reverbs and Dual Showman Reverbs out there. Bassman 6G6 First tube is bass channel preamp, 7025 is specified.
Greg kept his illness very private, even from this author. . Connectors, Sockets 892 American Transformer Transformers 897 Tresco Transformers 906 Coilcraft Transformers 908 Aerocoil Transformers 918 Oaktron? Next, if applicable look for the date code on the tube chart. Special thanks to Bassman specialist extraordinaire, Clarke Blanton for his assistance with updating the Bassman dating tables and providing other Bassman facts and figures. The last version had a super bright neon blue which held its tint.
Black transformers have a four digit date stamped into the bell housing. This tube need not be low-noise or nonmicrophonic. This is free information and you are welcome redistribute it under certain conditions; see for details. The bottom set is the date code. There are exceptions to this rule like the the Bronco.