[R-390] Strange 390A problem

[ToddRoberts2001 at aol.com]

In a message dated 7/15/2006 8:26:16 AM Eastern Standard Time, 
r390a at bellsouth.net writes:
For several years, my '63 Imperial has had an odd presumably AGC  
related problem.  At intervals sometimes approaching hours, it will  
reduce gain by as much as 30db.  It does this regardless of IF module  
installed, tubes, etc. Voltages remain constant. (just something I  
ask every couple years or so)

Suggestions?

Tom NU4G

Does it do this on all bands or just one band? I have seen an R-390A where 
the gain changed up and down and traced it to a bad / leaking silver mica cap in 
one of the RF Deck transformers. Replaced the cap and everything was normal 
again. The old ruby-red moulded Silver Mica caps are notorious for intermittent 
/ weird behavior. 73 Todd WD4NGG