[R-390] Noise when warm ('390A)

[Dennis Wade]

Update.

First thing I did was start unplugging modules to try and see when it went away.

Guess what.  

It goes away when the antenna is unplugged  (sigh).  Sorry guys. 
Should have checked that first, although it still doesn't sound like
its from the antenna.

Is there any failure mode anyone can think of that would only be
apparent when the antenna is connected?  Haven't changed the antenna
configuration here by the way.  Its a 120' dipole fed with open wire
line to a balun.  Coax to the balanced antenna jack fed according to
Rippel's instructions.

      Thanks for all the suggestions from all.

               Dennis

On 9/11/05, llgpt at aol.com <llgpt at aol.com> wrote:
> The voltage regulator tube OA2 has been known to have those symptoms.
> 
> Les Locklear
> Gulfport, MS.
> 
> -----Original Message-----
> From: Dennis Wade <sacramento.cyclist at gmail.com>
> To: R-390 HF Receiver List <r-390 at mailman.qth.net>
> Sent: Sun, 11 Sep 2005 15:07:08 -0700
> Subject: [R-390] Noise when warm ('390A)
> 
> Hi everyone,
> 
>       I've noticed lately that after a few hours of operation, a
> "frying bacon" or "snap-crackle-pop" noise begins to occur, slowly
> increasing as time goes on.  No real difference in band or mode.
> 
>       Any quick troubleshooting hints to isolate to a stage?
> 
>       What is the consensus...more likely a cap or a tube?
> 
>             Thanks for the advice,
> 
>            Dennis
> --
> Dennis L. Wade
> KG6ZI
> Carmichael, CA
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-- 
Dennis L. Wade
KG6ZI
Carmichael, CA