I cannot get the tremelo circuit to work properly in my Super Reverb. I put a switching pot on the intensity control to lift the tremelo circuit when I'm not using it, and it works fine. I put in a new optooscellator(sp?) for the trem circuit. When I turn up the speed control, I get a pulsing sound out of the amp, but my guitar signal remains unchanged. I just wondered if anybody has some thoughts on this malady.