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Most of the maintenance and mod tips below will make the amp break up earlier, reaching the sweet spot at a lower volume.
Tube mods (pulling V1 out and a 12ax7 PI) will take you a long way, and if you also invest in implementing the tremolo disconnect mod, you may get a fatter, warmer and fuller tone at practice volumes.
Unfortunately does the diode rectifier not offer any options for rectifier tube swaps to select among different plate voltages, clean headroom levels and sag characteristics.
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.
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.
These tubes have different frequency responses than 12AX7, particurlarly when distorting.
It reminds us more of a classic 80w Twin Reverb than a Bandmaster Reverb, and it shared its circuit design with the Pro Reverb and Super Reverb at that time.
The silverface Bandmaster Reverb is a typical ab763 amp and shares basic circuit design with the Super Reverb, Deluxe Reverb, Twin Reverb, Vibrolux Reverb, Pro Reverb and Twin Reverb.
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.Personally we favor the Jensen C12n for their natural and transparent “Fendery” tone and, most importantly, for not being to bright and harsh.The C12n sounds very punchy, wide and deep in a 2×12″ cabinet.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).The vibrato channel in the Bandmaster is even more clean than the Bassman because of the vibrato circuitry loading the signal chain and reducing the gain level in the premp section.