Dating silverface deluxe reverb
The only indication of power is the “300 watts” label on the back.
I've wanted a silverface Twin or Pro Reverb since I was a teen.
Model/Circuit Number: AC568, AA769, AA270 Years of Production: 1968 – 1982 Era: Silverface Configuration: Combo Controls: Silver, forward facing w/ blue labels Knobs: Black skirted w/ chrome center, numbered 1 – 10 Faceplate Bias: Fixed, adjustment pot or balance pot Rectifier: Solid State Comments: A master volume was added in 1972.
Other late seventies circuit changes included a Line Out jack, hum balance pot, and a pull boost sw.
I just got a ’70s silverface Fender Twin Reverb that needs a little TLC.
Surfing the various forums, I’ve learned that this master-volume edition of the Twin is one of the most (unfairly, to me) maligned designs.
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This boost is activated via a master volume control with a push/pull switch. From the most unlikely of places: the reverb drive signal!
The reverb drive circuit in most tube-driven reverb amps is actually similar to a small, low-power, single-end output stage.
The tube is fed a signal (from channel 2, or the “vibrato” channel, in the case of Fender reverb amps).
The tube’s output connects to a transformer, exactly as in a single-ended amp like a Champ.