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I've done this numerous times. But there's a caveat. It's always been on the standard layout with the damper in series with the B+ line going to the flyback.
I never did it on a pre-standardization layout where the damper is not in series. Your porthole is probably pre-standardization, so it might not work. Probably wouldn't hurt to try, though.
Try a disc cap of around 47pf - 82pf @4KV.
A quick check of the schematic will tell if it's a series layout or not.
(EDIT.) Have you checked the G2 (screengrid) voltage on the H out tube? If it's low it'll cause reduced width and HV.
Last edited by old_coot88; 09-15-2015 at 10:17 AM.
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