With three preamp gain stages can send both channels through the third preamp Won't damage them but the tone will be thin and funky. Their channels because the Normal channel only uses the first two preamp stages and the VibratoĬhannel uses all three so the two channels are out of phase (each gain stageįlips the signal voltage). Amps with three gain stages cannot jumper The amps with two preamp gain stages can jumper theirĬhannels together for a fatter tone. Signal loss from the reverb circuit but the extra stage more than makes up for the lossĪnd gives earlier dirt and more total distortion. The primary purpose of the extra gain stage is to make up for The Deluxe Reverb, Super Reverb, Vibroverb and Twin ReverbĪmps. The blackface amps without reverb, the Deluxe, Vibrolux, Tremolux, Pro,īand-Master, have only two preamp gain stages compared to three stages in The other AB763 amps fall between these two extremes.Īll the AB763's with reverb have "verb" or "reverb" in their Preamp gain stages, a no-sag solid state rectifier, four big power tubes andĭual 12 inch speakers assaulted by 85 watts. Mighty Twin Reverb has high output power and output transformers, three 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
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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 AB763 Blackface Amp Model Differences What's the difference between a blackface
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