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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.
This mod does not alter the tone significantly when amp is played clean or when only the power amp section distorts.
You’ll have to increase the volume setting to achieve a similar volume as before.
Not only is there more action in the preamp section, the silverface Bandmaster Reverb also has less attack and less clean headroom in the power amp section due to the tube rectifier.
The Bandmaster Reverb head is therefore quite similar to the amps in the Pro Reverb and Vibrolux Reverb, just without the speakers.
The C12n sounds very punchy, wide and deep in a 2×12″ cabinet.
See page How to select speakers for speaker recommendations. If you want cleaner and spankier preamp distortion charcteristics, you may replace the V1 or V2 12AX7 preamp tube with 12AT7 and 12AY7.
The main differences between these amps are transformer size, filter caps size and output/speaker impedance.
Let’s study the blackface Bandmaster AB763 and blackface Bassman AA864.
They are similar in the way that both are clean sounding with just one 12ax7 tube in the preamp stage (vibrato ch in bandmaster and normal channel in bassman).
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.