[TinCanAlley]

Originally Posted by zeno

Ringing may or may not be amplified, depends on circuit.
Grounding the ABL base will kill the ABL. If the jailbars are getting
in there they will go away. You may or may not see other changes
without ABL.
B+ lines should be clean, sometimes there is a very small amount
of hash but nothing like 5% or 10% of voltage.
With this problem you have to take things in order.
1) be sure all B+ are clean & correct
2) scope starting with the detected video from IF strip pin 5
3) work your way to the right through video til the
waveform goes "bad" thats where it gets in.

73 Zeno

When you say the IF strip pin 5, do you mean the one labeled "C1"? I'll post an pic of the waveform I get from the B+. It's unlike any other waveform I get. It is similar to the ringing on the ABL base, but it is a multiple waveform of about 5 or more like you're on acid and tipping. It also expands and contracts from about three to 5 or more. It's only on the B+ that I get more than a single line waveform.

I've traced the B+ to two different sources. One is from a line from the transformer that is amplified by a diode and then is tapped into the canister. From there it goes to the chroma module and makes it way around the boards. The other B+ comes from another line of the transformer and goes though a resistor and then on to the horizontal board where it connects to the pin right next to where the first B+ connects. It's a loop, but why from different lead of the transformer and why is only one end filtered by the caps?

When I get home I'll take a picture of the waveform I mentioned and post it.