[R-390] R390A Volume fluctuation

[Larry H]

Mike,  It could be a few different things in the RF, IF or power supply.
See if you can measure the B+ and +150 when it's good and bad.  Does it
happen only below 7.999 mh or also above?  Try reseating all the tubes in
the RF (except calibrator), IF (except V507), and 2nd xtal osc.  Try
wiggling all the connectors including antenna.  Is this a good operating rx
up til now?  Try measuring osc injection voltage to 3 mixers when good and
bad.  Have fun.

Regards, Larry

On Sat, Jun 22, 2019 at 7:18 AM <n7msk at charter.net> wrote:

> The volume started fluctuating from normal to low - Not frequently but
> often---- When the vol drops off the Carrier level needle drops off also-
>
> What's going on - the fix?
>
> Thanks, Mike
>
>
>
>
>
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