LOVE this amp and it has never let me down. Honestly, I haven't had the need for the reverb on this much, but was dismayed to find that it doesn't work now. How does that circuit work on an amp like this, anyway? The tube is good. The RCAs going into the reverb pan seem solid. I don't have an official Zinky foot switch, but I have tried it with a variety of other switches and cables (both mono and TRS) and all I get is buzz when I turn the reverb knob up. It's the one area of an amp circuit that I'm not so sure about. I assume the RCAs send signal through the reverb spring and then return it back into the circuit.