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Sounds to me like your screen(pin 4) may be drawing too much current which would cause the screen voltage to be low. Have you checked the cathode voltage(pin 8) against what Sams calls out? The horizontal drive will adjust the cathode current and generally you want to adjust for lowest current by inserting a ma meter in series with the cathode. A Sams folder should give some specific directions for setting the drive control. Also I'd try another damper if you have one. Specifically what schematic are you using?
Last edited by Kevin Kuehn; 09-12-2018 at 06:57 PM.
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