Got a Valco-Supro amp on the bench, came in for a non-functioning tremelo, I found a failed resistor in the circuit (one of the leads broke). I couldn't find a schematic anywhere for it so I traced it out and drew one up myself.
This is a bit different than the typical Fender circuits I'm used to seeing, either the roach circuit on the bigger BF/SF amps, or the bias wiggle as in the Princeton Reverb, or the brown face trem circuits as in the 6G12 Concert. This circuit uses a single triode that ties to the cathode of the input gain stage. The trem action is very nice, but without an intensity control it's a little much. The range of speed control is good though, allowing a nice slow tremelo action up to faster than I'd typically use.
Anyway, just thought I'd share it here. If you could add an intensity control to it it would make a nice way to add tremelo to a cathode bias build, using only one triode to get there.
This is a bit different than the typical Fender circuits I'm used to seeing, either the roach circuit on the bigger BF/SF amps, or the bias wiggle as in the Princeton Reverb, or the brown face trem circuits as in the 6G12 Concert. This circuit uses a single triode that ties to the cathode of the input gain stage. The trem action is very nice, but without an intensity control it's a little much. The range of speed control is good though, allowing a nice slow tremelo action up to faster than I'd typically use.
Anyway, just thought I'd share it here. If you could add an intensity control to it it would make a nice way to add tremelo to a cathode bias build, using only one triode to get there.
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