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#46
03-03-2010, 03:06 PM
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argh, new strong sync tube and vert osc/video amp tube, and no joy, still critical setting that will drift, so tonight I will be making up an vert low pass filter integrater.
I figrue it can't hurt. I am assuming the sync signal I see off the sync tube is ok, I see practially nothing resembling a sync pulse at the grid of the vert mult tube. 
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#47
03-03-2010, 03:42 PM
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Just to be sure I injected a composite signal at the testpoint, I just wanted to make sure my IF was not clipping, and I get the same roll instability (and the same looking video sync look on the scope from the output of the DVD) so I am pretty sure it has to be a vert integrater (not much left).
There is a network that takes the video signal and couples that to the sync tube, I have to assume its ok since the horz is working fine, and the horz has to come thru there as well.
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#48
03-03-2010, 07:45 PM
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FAR OUT
 ROCK SOLID ON VERT ROLL!!! I made up a little pcb with some copper clad perboard and discreate parts, works GREAT! you can practically turn the vert hold 1/4 way before it breaks loose. Got my favorite B&W back in action.
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