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Old 9th Nov 2018, 10:18 am   #12
Heatercathodeshort
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Join Date: Jun 2005
Location: Warnham, West Sussex. 10 miles south of DORKING.
Posts: 9,145
Default Re: Cossor 54 1938.

I bet that modification was not included in the Mullard Application laboratories notes on the ECL80..

Great little conversion. That 4TP sounds familiar David but it would take me a week to discover if I have one.

All electrostatic tubes suffer from very short life. Massive gun assembly filled with air molecules. Have you tried increasing the heater volts by 10%? This can have a dramatic effect on picture quality. John.
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