[timmy]

Originally Posted by Yamamaya42

You can think of the AGC as sort of a comparator circuit.
The reference is the pulses from the FBT via C59 there is boost potential on the far side of C59, thus it is a 2kv part, the pulses are 450v ptp.

It gets compared to matching pulses from the video amp that is being fed in via the tuner/IF, if this is too low, it will raise the gain of the IF and tuner stages, if too high, it will lower it.
The matching pulses from the video amp can be enhanced / adjusted with pulses from the FBT via C60 & R14, but if there is no incoming video, or if the video at the video output stage is too low, then AGC will be stuck thinking that levels are too low, and lock the gain at the highest level, and R14 will have no effect no matter how you set it.

Again, there is 700+ dc boost potential on the far sides of C59/C60, but should only be passing AC pulses to V6, if they are passing DC, then they are leaking and bad.

Those 2 caps you mention are the 470pf and 2.2pf I guess it wouldn’t be a bad idea to change them both I do have them or I should lift one leg on each cap and check for ac or dc. At this point I don’t know the next step to take with the video.