[R-390] R392

[Guido Santacana]

The more I hear it, the more it smells to an audio circuit problem. It
takes about 5 minutes for the noise to appear after turning on the radio.
After reading both Charles and Bob's recommendations sounds like a cracked
resistor but could be any of the other alternatives. Tomorrow the radio
goes on the work bench ( in my case a small mechanics folding bench from
PepBoys). I will report my findings. It's been quite a while since my last
R392 repair.

Thanks for the recommendations gentlemen. Highly appreciated.

Best 73s

Guido

Guido Santacana KP4FAR
EAC-R390A, Steward Warner-R392

On Mon, Jun 19, 2017 at 6:59 AM, Bob kb8tq <kb8tq at n1k.org> wrote:

> Hi
>
> I’d put “60 year old unsoldered connection” on the list along with
> “cracked resistor”.
> Both are a poke around a bit and listen to what happens sort of thing.
>
> Bob
>
>
> > On Jun 19, 2017, at 12:12 AM, Charles Steinmetz <csteinmetz at yandex.com>
> wrote:
> >
> > Guido wrote:
> >
> >> There is some popping before it come back
> >> so I suspect a bad cap in the audio section.
> >
> > If the volume control has no effect, the problem would appear to be in
> the audio section (V606, V607, V608 and associated circuitry).
> >
> > Bad cap is certainly one possibility, but don't forget the most common
> source of such problems, namely noisy contact between tube pins and their
> sockets.  To check, just put your finger on top of each tube (one at a
> time) and wiggle it a little.
> >
> > Best regards,
> >
> > Charles
> >
> >
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