[R-390] AGC Problems

[Jim Brannigan]

I don't recall the correct AGC voltages, but -1VDC seems low.  Did you align
the IF, including the AGC amp?

Jim


> I have a nice Stewart Warner 390A with a Collins IF  module.
>
> I can't seem to get the AGC voltage I think I should get.
>
> WIth 30- 40 uv RF in at 1.5 MHz I get plenty of IF output and > -10 volts
output on the Diode load- but < -1 volt on the AGC line.
>
> What should the AGC voltage be? I have seen values quoted upt to -10
volts?
>
> Any ideas on what I should check? Have checked tubes and caps in the area
of the AGC amps, detectors etc.
>
> Any clues will be greatly appreciated.
>
> Thanks
>
> Sam