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Old 9th Feb 2018, 9:40 am   #18
Heatercathodeshort
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Join Date: Jun 2005
Location: Warnham, West Sussex. 10 miles south of DORKING.
Posts: 9,145
Default Re: GEC BT336 possible tube change

Replacement of the frame output valve will cure the slow warm up/telegraph lines. It sounds very tired. These output pentodes were very prone to this.

Providing you have replaced the boost cap it should get better as you say, as the overwind dries out.

I have a PL84 going spare. I have put it on one side for you when you visit. John.
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