Fender Twin Reverb Silverface Master Volume Schematic. Twin reverb silverface 1978 vibratone. I have a 73 74 dual showman reverb built into a twin reverb style cabinet with two g12 100 speakers.
Super reverb aa763 ab763 ab568 aa1069 aa270 cbs 45w mstrvol cbs 70w mstrvol super six reverb 100w 100w master vol. You can add preamp clean headroom by changing the two power voltage dropping resistors to the twin reverb values which will bump up the phase inverter and preamp plate voltage. Schematics and layout diagrams here are hundreds of original fender schematics and layout diagrams available for free viewing and download.
Master volume pull boost.
I recently removed the master on a silverface twin and it sounded just fine i simply followed the ab763 layout and removed and replaced only the necessary components to accomplish the job while i was in there i switched it to a bias adjust from the bias balance system and was able to get the tubes working a bit harder than 25ma it sounded quite nice. The schematic for the deluxe shows only 170 idle volts on the preamp tube plates while the twin reverb shows 270v. X 10 brand x x 15r brand x. These are invaluable reference tools if you are digging around inside of your vintage fender amplifier.
