{Collins} Re: 75A-1 problem

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,


James KB2FCV


From: Donovan W. Case [mailto:dwcase@xxxxxxxxxxxxxxx]
Sent: Monday, December 31, 2007 12:38 PM
To: Kern, James
Subject: Re: {Collins} 75A-1 problem


Hi James


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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