[R-390] R390A AFGain Pot Repair

Tue, 1 Jul 2003 20:49:26 -0400

All: I have had a defective LOCAL AUDIO pot for some time and would very
much like to replace it.  The usual suspects (Allied, Newark, Digi-key,
Mouser, etc.) don't seem to want to stock much in the way of audio-taper
pots.  Anyone recommend a good source for this?

Dave Maples

-----Original Message-----
From: [email protected] [mailto:[email protected]]On
Behalf Of Peter Worrall
Sent: Sunday, June 29, 2003 6:43 PM
To: [email protected]
Subject: [R-390] R390A AFGain Pot Repair

I had noticed a marked deterioation inb the Audio quality and level of a
Blue Streak 390A I have here. When I renovated the receiver I never changed
any of the pots, spending most of the time on the cleaning and re-capping of
the modules.

Any how I measured the AF Gain pot, and found that it had soared to more
than 8k-ohm in value. I had to get the DVM on the bench, as I did not
believe what my AVO-8 was telling me!....Bothe were in agreement in the end,
so I changed the pot for a 2500 ohm one from the junk box as an initial
replacement.

The result was perfect audio and lots of it too! This pot is in one of the
audio stage cathodes and, I guess mine had just worn away with use.

Anyone with weak and distorted audio would do well to ckeck the value of the
pot before launching into a more detailed diagnosis!

73 to all

Pete
G4GJL

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