Hey folks, what I have here tonight is a repeat amp to the house. Few years ago, a dear friend brought me his amp and a new cabinet he ordered from Mojotone. I put it in the new cabinet for him, cleaned all the pots and sockets and also replaced both the speakers as the two he had were not original, one 16 ohms and one 8 ohms, and the cones had several tears in them. Mind you this was a very hard working amp by a local legend and nobody could ever figure out how he ever had such a great clean sound. Me either - whew. Okay I put two Emi 1058's in it and the amp sounded fabulous. Never heard it sound so good. Okay round two - Friend has sadly passed, his estate sold the amp to a cool guitar player. Amp sounds good, then starts crackling after being on for a while. It took about 45 minutes for me to get it to happen, but it did. So I put the cable into the Normal input and it's not happening. I figure I'd open it up and start looking at stuff on the Vibrato channel. I take it out of the cabinet and set it on boards as is what I have to work with, make sure the speakers are plugged in and turn it on. Well for the love of ivy the amp starts sounding like a slo-motion techno phase shifter. No guitar signal passing at all. I pull V1, V3, V4, turn it on and I get nothing. So I put it out of mind for a day or two. Came back to it today and the darned thing works. No more odd slo mo BS. So I started to chopstick and it seems like I can duplicate the noise I heard while I was playing the amp when tapping on a few solder joints; especially where the 100K resister meets like 4 other components. Re-soldered that one and another by a capacitor that was microphonic in the reverb section. Fired it up and it seems like those areas of concern have been stopped. But ... I figured I would just check the bias. Amp has no 1R resistors so I do the transformer resistance method - Well to be honest I think it's biased way on the low side but..... the huge but here is that I can't get the CT of the OT to stay calm nor either one of the plate voltages. So it's really hard to know what is happening. 421 to 416 on the CT and 414 to 418 on the Plates. What can make the OT voltages float around like that?