[R-390] AGC Line Again

[ROSS HOCHSTRASSER]

Hi Larry,  The diode load voltage  is -40 volts DC and the voltage at the wiper of 523 is .089 volts. Yikes!! Thanks, 73 Ross 

> On February 18, 2020 at 8:18 PM Larry H <larry41gm at gmail.com> wrote:
> 
>     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 mailto: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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