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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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