Quote:
Originally Posted by timmy
Just for the heck of it chassis back on back but upon plugging it in have a test lead on v1 with antenna and just as the hv came up it jumped 4kv and when it did the voltages on v1 and 2 neared 100 v then hv dropped again did this twice this just about confirms something is getting in or shorting intermittently somewhere. I never seen this since working on this chassis.
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The voltages when it first comes on really don't mean that much, it's once it is all warmed up and stable that matters.
There is a reason for doing the AGC bias test, this goes back to 2016 when I was working on my CTC-16XL and it too had IF problems, and old_tv_nut said the following..
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The AGC circuit is a feedback circuit. This means that the 9 volts at the plate does not necessarily mean anything is wrong with the AGC circuit itself. It may be getting an incorrect detected video signal at the grid due to some other reason (like a dead IF) and trying to correct it by changing the AGC voltage. You need to check the detected video for starters. If it's missing, check and/or replace the AGC tube. And, you may be right that some component is bad. Check all the voltages in this area. Check resistor values wherever voltages are way off. Further trouble shooting could involve breaking the feedback loop by connecting an adjustable bias to the AGC line, as you would for aligning the IF. If video is missing or wrong amplitude and you can't get it by manually setting AGC bias, there is something dead in the IF or tuner.
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so please try that bias override, and see the results.