[R-390] Low Audio

[ToddRoberts2001 at aol.com]

In a message dated 12/12/2005 12:45:30 AM Eastern Standard Time, 
fwbray at mminternet.com writes:
I am a new R-390A owner and am encountering a problem.

Over the weekend, I pulled the front panel so that I could align a 
couple cams and clean the pots and switches on the front panel with 
Deoxit.  I also pulled the power supply and audio deck to do basic 
chassis cleaning with a paint brush and WD-40 on a cloth.  Upon 
reassembling the radio, I found it has very low audio, with some 
distortion when I crank up the local audio gain.  However, everything 
else seems to be working normally.  I have swapped the audio deck tubes 
with known good ones, just in case, but this made no difference.  It was 
working before I started, but clearly needed to have the pots and 
switches cleaned.
Is there anything obvious I might be overlooking?
Thanks.
73,
Fred
KE6CD

Try turning on the limiter and see if the audio sounds better or louder. If 
this is the case there may be some bad caps around the limiter tube V507. The 
ones that usually cause trouble are  C532 and C537. Also check limiter tube 
V507. 73 Todd WD4NGG