[Username1]

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Hi So if that scope pic you posted is from the Base of Q402 then it loos like to me, and
my Squirrel companion, that there is a good bit of overshoot on the rising edge. I don't
know if'n yer schematic picture is of better clarity than what is posted, but I don't see
the same overshoot there..... But before we go there..... since we are looking at a
square wave thingie, does your scope have the test calibration post, where you
put your probe on it and then adjust the variable cap on the probe to adjust
it's LC balance so you don't have probe induced overshoot on your scope picture?

So if all that is sorted out, then you may have found your source of noise that
you are seeing on the screen..... See that decaying oscillation at the rising
edge is much higher in frequency than the horiz frequency, so that may
be making your "Jail Bars" looking stuff.....

I think, and the Squirrel Concurs, that you should poke around in that area and
see if there is a bad soder joint or something else, since you said you replaced
all that stuff over there.....

Good work, on that stuff, and finding a possible cause....

You may be able to add a very small .pf value ceramic cap
to the base of that transistor to see if you can dampen
it out a bit, and if it does, dampen it on the scope,
then see if it does it on the TV screen as well....

PS - While you are in that area, you should
check all wave forms, and check voltages
too & Please post any differences in
detail. - Thanks & Good Evening.

May the Squirrel be with you!

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