Quote:
Originally Posted by peter_scott
Thanks Lloyd,
I just tried another one that I had lying around and it may still need to be stronger but I think it has given me some improvement especially in overall focus.
You guys are great!
Peter
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Picture attached, out of focus and too much contrast.
When I finished my TV22 and optimized the H drive I did notice a zone of abnormal linearity where the damped current is fading away and the PL38 plate current is increasing. It caused a zone of flatness the circle perimeter as the rate of increase of yoke current with time reduced (or the beam deflection velocity slowed just a little in that zone) Picture attached to show where the defective area was between the green lines, giving it a slightly egg shape effect. Also just to the right of the right green line, seen by the rectangles, the scan is a little compressed there too. Not too severe, ok perhaps for a domestic TV but it wouldn't have cut it for a studio video monitor. Interesting that it is different from yours so some of the circuit constants mustn't be exactly the same.