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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.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.
These tubes have different frequency responses than 12AX7, particurlarly when distorting.
People describe these tubes to have less harsh and buzzy distortion.
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.
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 blackface Bandmaster is therefore ideal for those who look for a pure Fender clean sound without making ones ears bleed.The blackface and silverface Bandmasters are medium/big sounding amps with a flexible speaker impedance of 4 ohm, allowing anything between one and four speakers (8 ohm each) to be connected via the main and/or external speaker jack.Summary The Bandmaster came with many different circuits during the blackface and silverface eras.The blackface head had a diode recifier, one normal channel and a vibrato channel with no reverb.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.