Wow, I had no idea that the problems could be caused by tube socket screws or aluminum shields! Thanks for all the suggestions, it looks like I have some work ahead of me. I’ve got a few other receivers I need to order caps for, looks like I’ll be adding another! I think I’ll be an expert at re-capping and re-aligning after all is said and done. Thanks again,
From: Donovan W. Case
I had the same issue with my 75A1, and have heard of others experiencing the same thing. I tightened all the tube socket screws, cleaned the sockets, and cleaned all of the varible coils (sprayed inside where the iron core moves). The problem disappeared. I used MG chemicals super contact cleaner with poly phenyl ether. Deoxit works well, too.
I noticed there was a fine iron oxide residue appeared with the spray cleaner. It made me think there was some surface rust starting on the iron.
Hope that helps.
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