[R-390] R-390a audio hum

[Guido Santacana]

Check the tantalum cap and multisection electrolytics in the audio deck.
The problem may be probably in one of these if they are the originals.

73s

Guido

Guido Santacana KP4FAR

On Mon, Oct 10, 2016 at 12:26 PM, Wayne Heil <wjheil at gmail.com> wrote:

> My R390A has a developed a horrible hum in audio output.  Could this be a
> short cathode to filament short? Any suggestions?
>
> '73,
> Wayne, KB6OQJ
> ______________________________________________________________
> R-390 mailing list
> Home: http://mailman.qth.net/mailman/listinfo/r-390
> Help: http://mailman.qth.net/mmfaq.htm
> Post: mailto:R-390 at mailman.qth.net
>
> This list hosted by: http://www.qsl.net
> Please help support this email list: http://www.qsl.net/donate.html
>