6/14/2023 0 Comments Bandmaster ab763 schematic![]() Two preamp stages, two small power tubes and a single 12 inch speaker driven by Lowly AB763 blackface Deluxe has anemic power and output transformers, Power tube type and number, output transformer and speaker configuration. Model differentiation comes from the power supply, the number of preamp stages, Inverter driving two or four power tubes in a push-pull Class AB configuration.Īll of the AB763 amps have tremolo and some Input, two or three preamp gain stages, a high output long tail pair (LTP) phase The basic AB763 circuit has two channels, both with a Hi and Low Graph is from the excellent and free Duncan The Mid control is set to 6.8k to simulate the standard 6.8k With the Treble and Bass tone controls set to maximum the tone curve clearly AB763 Mid Scoop With Treble and Bass Set to Maximum (Treble, Mid, Bass) tone stack sets this mid frequency scoop. The blackface tone is known for its "mid scoop." The AB763 TMB Layout below have been annotated with component functions so use them for AB763 The AB763 circuit is considered by most to be Tail pair phase inverter and so carried a different circuit designator. Princeton or Harvard because these little amps did not use a long "Blackface" refers to the panel color and 763 means July 1963.ĭeluxe, Deluxe Reverb, Twin Reverb, Super Reverb, Band-Master, Showman, Pro, Vibrolux, 'AB763' was Fender's internal model designation for the 1963īlackface circuit. Have comments or corrections? Email rob at: robinette at The production date code for the amplifier.AB763 Blackface Amp Model Differences What's the difference between a blackface The last line will have 2 letters of theĪlphabet either printed or written by hand. "sign-offs" at the completion of sound and electrical tests, Is a Black and Silver label, which contains several lines for Which may be found on the back of the amp chassis. This code is located on the "QA" (Quality Assurance) sticker, ![]() Manufactured after 1989 include a date code on the amplifier. An example would be: EIAĦ06-4-21 would mean the 21st week of 1964. The last twoĭigits would refer to the week of the year i.e. If four digits are present, the first two digits Present, the first digit would refer to the year i.e. Numbers always begin with "606", and are followed by three orįour digits in various combinations. Transformers may help you to determine the date of production onĪmps that fall between the different dating schemes. These codes are for amps with the serial number beginning with a Therefore, if you have a push-pull pot, your amp is 1974 or newer.Īmps do not have a date code stamped on the tube location chart. A push-pull pot was added to some amps in 1974.In 1973, Fender removed the "Tail" from the logo.Making them a little less desirable than the blackface amps.Ī good amp tech can make these sound great. ![]() Silverface Amps began in 1968, when Fender made circuit changes to most amps,
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