RogerAF

Thanks, I got the Treble control working again. I'm not sure what the exact problem was, but I pulled the PC Board up to get at the solder side and found several cold joints. I re-soldered all the connections that were questionable and everything began working again, except for the Presence. I checked all the values of all the components in the chain and they all checked out. The connections all have good continuity, but the control does absolutely nothing. I wonder if the tube it connects to may be faulty, but I have no tube tester anymore and since the tube passes signal, I don't want to screw around too much. If I had a spare tube, I'd try replacing it, but I don't, so I'm living without it. (I never set the tone or presence below 10 anyway.) The amp sounds great, so I'm not going to mess with it anymore.
Thanks for your reply,
Roger