[R-390] Intermittent

[Cecil Acuff]

Sounds like the ballast tube has a broken filament that is just touching or 
one of the tubes in that series string.  I'd have to look at the schematic. 
The fact that it fades in and out slowly indicates a tube filament heating 
and cooling causing the tube emissions to go up and down.

Just a gut guess though...

Cecil
----- Original Message ----- 
From: "Gary Harmon" <gharmon at idworld.net>
To: "R-390" <R-390 at mailman.qth.net>
Sent: Friday, November 13, 2009 8:45 PM
Subject: [R-390] Intermittent


> My R-390 has intermittent signals.
>
> Sometimes broadcast will come on in about a minute and then operate for
> hours before the signal drops out.  It may come back or it may not.  When 
> it
> drops out or comes on it does it slowly like something turning on or off.
> When the signal drops out, audio hiss remains.
>
> All tubes have been checked but not lengthy tests.
>
> Suggestions anyone??
>
> 73,
>
> Gary H. Harmon, Jr. - K5JWK
> 6003 Archwood
> San Antonio, TX 78239-1504
> 210.657.1549h
> 210.884.6926c
>
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