Here's the latest update
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I've changed several 1000pf decoupling caps, set the ion trap to get highest brightness and centered the picture as best I can (the adjuster seems notchy and vague).
Unfortunately there's not enough adjustment on the focus adjuster to bring it into focus. Tomorrow I'll have another go at the ion trap, hopefully I'll be able to move it forward and improve the focus, without loosing brightness
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Compared with the photo in post #15 there seems to be minimal improvement, maybe the contrast is slightly better but I'm now beginning to worry the tube is tired?
Regards
David