Quote:
Originally Posted by DaveWM
yep that's it. Very cheap pots used on the back. every single pot in the front is also very dirty. The IF section is all SS, my other one has a good pic, but a bad tube socket (I think) in the blue output tube (likes to flicker more or less blue) socket. I checked the PCB very closely, triple checked all the ground stakes, prodded the parts around it. if you move the tube it would flicker blue. a real PITA. I don't like the use of large PCBs for tube sets, just seems to be asking for trouble.
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If trying a new tube ,cleaning the tube pins and socket, and reflowing the traces going to that tube don't help then you should swap the socket out for a new one.