OK agc amp tube seems to be way off with voltages. Correct voltages are pin1 (-6.8vdc)
pin5 (-140vdc)
pin6 (+115vdc)
My readings.
pin1 -36vdc
pin5 -2.17vdc
pin6 162vdc

Yeah I think we have an agc issue here. Any suggestions on where to start with the agc? I also must mention that I have no sound whatsoever. Speaker isnt even being driven but the speaker is good. I am more concerned on the agc issue now however.

Anyone?

Did you see the note under the Sams voltage chart that mentions the voltages on pins 1,5,6,7 are referenced from pin 7 of the AGC tube? EdKozk2 mentioned it in an earlier post. Earlier you mentioned you have -4.17v on the AGC line, which is really close to the specified -5v. Being that close I can't see how the AGC could not be working, there's no other place that -4.17 volts could be coming from. If you want to play with the AGC voltage, pull the AGC tube and substitute it with a -5v power supply voltage.

Yes I used pin 7 as the ground for the measurements. I do see a 47k isolating resistor coming off of Grid 1 on the agc tube that I did not replace. Should I replace that one? Or is it not critical?

As long as the 47k is within 10 percent it should be fine.

There's some very good reading here on page 5, on how this pulsed ACG circuit works, along with trouble shooting tips. References the schematic on page 14.

http://www.earlytelevision.org/pdf/a...n_sup_20a1.pdf

Are you getting any change in ACG voltage when you vary the input signal strength, as well as the contrast control?

I never realized this chassis used such a complex AGC circuit. Not the easiest circuit to understand.