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#16
09-04-2019, 01:22 PM
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Have you checked that the AGC is working correctly? It almost strikes me as slight signal overload. Turning your signal generator output way down should verify.
Last edited by Kevin Kuehn; 09-04-2019 at 01:26 PM. 
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#17
09-04-2019, 01:29 PM
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The up and down wiggles on horizontal lines at upper left may be the yoke. (But I'm wondering why they aren't the same from top to bottom - maybe the pincushion circuit?)
The left and right wiggles at the top are probably just the horizontal AFC. (Reacting to non-standard sync from your cross-hatch generator? It would be interesting to check if you get the same result with a DVD source.)
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#18
09-04-2019, 04:17 PM
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Quote:
http://videokarma.org/showthread.php?t=268858
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#19
09-04-2019, 05:23 PM
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The crosshatch is actually from a DVD that I made with a few test patterns on it. Some time later on I'll get a schematic for this and see if there are problems with the sweep waveforms. I did have to put in a new 36KD6 since the one that was in the set when I got it was broken.
__________________
Erich Loepke
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#20
09-20-2019, 08:19 PM
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I finally found the problem, but don't have a really good fix at this time. The top core of the pincushion saturable reactor had fallen off and is lost. It was simply glued on when it was made. I did a "fix" from a few small ferrite cores glued together and then glued to the saturable reactor. The pincushion control has some effect now, just not enough. The problem is these transformers use a special core material that saturates easier than the ferrite I used, that's why I have only partial control at this time.
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Erich Loepke
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