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The reason is that 12AX7 tube has a voltage gain factor = 100, while 12AT7 = 60 and 12AY7 = 45.Pull out the V1 normal channel preamp tube – More preamp gain in vibrato channel We’ll start with saying that this is a mod we personally do to all dual channel blackface, silverface and reissue amps.Yes of course some have the mid knob and bright switch while others don’t.All these ab763 amps with reverb has the gain stage in the reverb recovery circuit which the non-reverb amps don’t have.This makes it possible to adapt to small and big stages and gigs just by configuring the speakers.Most of the maintenance and mod tips below will make the amp break up earlier, reaching the sweet spot at a lower volume.Five fundamental tricks to create the holy grail of Fender tone Here is a video demonstrating the effects of some of the mods and tricks described here.To see embedded text comments, go to video on Youtube.
The main differences between these amps are transformer size, filter caps size and output/speaker impedance.
You’ll need schematics to implement some of these mods. We usually start with explaining a mod from a functional perspective where we relate to components in the logical schematics diagram.
Finally we point out location of components in the physical layout diagram.
The Bassman has a slightly bigger output transformer resulting in a firmer tone and more attack.
A smaller output transformer will introduce sag and compression in the power amp section.