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Heatercathodeshort · 11th Feb 2018, 10:19 am

If the height increases in keeping with the reduction in focus the EHT must be falling off.
Certainly sounds like a damp overwind. The whole transformer is dipped in pitch but it is the overwind that is almost certainly causing your problem. J.

11th Feb 2018, 10:19 am	#23
Heatercathodeshort Dekatron Join Date: Jun 2005 Location: Warnham, West Sussex. 10 miles south of DORKING. Posts: 9,147	Re: GEC BT336 possible tube change If the height increases in keeping with the reduction in focus the EHT must be falling off. Certainly sounds like a damp overwind. The whole transformer is dipped in pitch but it is the overwind that is almost certainly causing your problem. J.