I, too, have a Spectron with unserviceable channel. I originally bought 2 of the Musician III Mk2 amps with Bybees. One had a channel go out and sent whole amp to Spectron back when. Less than two years later that channel again went out. I was in email contact then, 2015, with Manh, and was going to send in the channel. He had suggested I swap locations, which I did and amp again worked for a time before the problem module again went out. When I tried to reach Manh, Spectron was done. I have kept this "paperweight" in case my other Spectron has a similar problem and could use the working module on the amp not in use.
I was reviewing my correspondence with Manh and recall that I had some issues reinstalling the pins from the module back into the amp. I now wonder whether something like Caig DeoxIT cleaner/conditioner might prove helpful for some of these channel problems. I also recall there was a period of time recommended to allow the capacitors to discharge. I remember doubling that period before opening the amp. I did get a significant arc that scared the ++++ out of me. I let the damn thing sit another 30 days before going in again.
