[R-390] R390A AFGain Pot Repair

[Peter Worrall]

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