[R-390] R-725 AGC quits working after 1 hr.

[Geoff Brozny]

HI,

First time posting to this list, have been subscribed for a couple 
months. I have not needed help with anything until now, and I am mostly 
new to this. I have a R-725 that works fine except for the AGC. After 
around 1 hr with the AGC in either Medium or Fast, it quits working. 
Audio distorted like I set it to MGC. I seem to be able to get it to 
work for what seems to be a random time by setting the AGC to slow, then 
after 10 seconds back to medium or fast.

The only issue I seem to have found is the two 1uf oil filled caps, C546 
and C547 which are parallel to create a 2uf cap. Tested while cold I was 
getting right at 2uf, hot I was getting something close to 6, so that is 
my suspected issue. Should I just replace these caps with a pair of 1uf 
film caps? I do hope I can fit whatever the replacements are under the 
chassis so it at least looks original from the top.

Thanks,
Geoff, KD8GRN