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I think your most telling post came around #134. In that post you put up
screen shots of the O'scope of the input of the video amplifier. This was also
smartly compared to a different set, a ctc 11, not that it matters.
What it does say, is that your scope, scope probe, are not distorting, or
un-necessarily loading the circuits.
The scope image also says to me that there is serious overshoots on vertical
rise items in the circuit. This can cause ringing, which could also be causing
harmonics, and other distortions around the burst signal as well.....
You should fix this first, I think it's giving you trouble down the line...
I think your problem is not in the color osc circuit, but before it..... You need
to figure out why your video detector circuit is allowing much higher
frequency response (is what I believe is going on) This could be an open
coil, or open cap in and around the Video IF and video detector area...
PS You already showed that your color osc works on yer breadboard
thing. Feed that osc a buncha noise and I bet it quits, or looks like
it quits. Your freq. counter acts like it does when noise is present
too, locking on different frequencies.....
It would be neat if'n you had a spectrum analyzer to see what's
getting to the vid. amp and ocs. grid.
just my 2 nuts worth....
(not those nuts)
.
__________________
Yes you can call me "Squirrel boy"
Last edited by Username1; 05-27-2015 at 12:33 PM.
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