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Old 04-26-2018, 07:22 PM
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Phil Nelson Phil Nelson is offline
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Quote:
Originally Posted by Phil Nelson View Post
If you go back to page 1 of this thread, you'll see that I removed a one-capacitor modification made by a previous owner: that cap paralleled the width coil and the idea seems to have been to affect the width. Now I'm tempted to reinstall a cap in that position and see what happens . . . .
Well, putting a cap (something from .33 to .66) across the width coil increases the width and lets you adjust for somewhat better horizontal linearity.

For comparison, here's the previous test pattern:



And here's today's pattern:



Not a great improvement, but something. It still feels like the horizontal circuits are just "off" in general -- the adjusters for horiz drive, horiz linearity, and horiz size are all maxed in one direction.

The worst horizontal linearity is not at the far left edge, but in a band that starts maybe 20% in from the left edge. If you squeezed that band horizontally, you'd have a pretty watchable picture.

Strangely, now it's easier to adjust for better vertical linearity.

Phil Nelson
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