Lately, my Super Champ has been making all sorts of ugly hum when the reverb is engaged (footswitch ON). Unless there's a shielding/grounding issue with the reverb wires to and from the tank (which I will check tonight), I'm guessing I may have a bad tube. Based on my rudimentary electrical knowledge, and looking at the schematic at the Fender Amp Field Guide (http://www.ampwares.com/schematics/SuperChampSch.pdf), I figure a tube issue would be one of two tubes. It looks to me like both halves of the 12AT7 in V2 are used to drive the reverb. Is this correct? It also looks like one third of the oddball 6C10 in V3 (V3C, specifically) is used for reverb recovery. Is this correct too? As long as I'm looking at tubes for this amp, I thought I'd look for some recommendations from members of the forum. V1 12AX7 (originally 7025) V2 12AT7 V3 6C10 V4 6V6 V5 6V6 The 6C10 is hard to find, so I'll take what I can get. Curious if anyone has recommendations (maker, vendor) for the other tubes.