[R-390] AGC Line Again

[Larry H]

Ross,  I've reread your posts and it sounds like the agc voltage decreases
at the same time as the meter reading increases.  The only way I can see
this happening is that the voltage at the cathode of V504 (and therefore
the voltage at the top of R523 (carrier mtr adj))  is increasing to cause
the meter reading to increase.  It doesn't take much change here.  The
current draw of V504 is usually quite steady.   Can you check that and the
diode load voltage, please?

Regards, Larry

On Mon, Feb 17, 2020 at 6:17 PM ROSS HOCHSTRASSER <bavarianradio at comcast.net>
wrote:

> I am currently monitoring the AGC voltage at the jumper. With the radio
> cold, I was measuring -9.01 volts relative to ground.As the radio warmed up
> 15 minutes or so, the voltage has dropped to -5.06 volts, the signal is
> distorted and the s meter is pinned. The s meter started at 60db . It is
> tuned to WBZ which is about 15  miles from here.(very strong)  I am going
> to see if the AGC voltage drops any further. If it doesn't, I'll shut it
> off and check the resistance to ground with the jumper removed. Correct me
> if I'm wrong, but wouldn't the problem be on only one of the mech filters?
> I notice no change when switching between them.  Many Thanks to all of you
> for your help in beating this demon!!
>
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