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Old 16th Oct 2018, 5:55 pm   #122
Heatercathodeshort
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Join Date: Jun 2005
Location: Warnham, West Sussex. 10 miles south of DORKING.
Posts: 9,145
Default Re: Help needed restoring a Murphy V310

If the 30P4 is not driven at it's control grid or oscillation stops it will overheat and the anode will glow red hot. If left switched on for an extended period the valve will self destroy but it takes a while and the 30P4 is a tough valve. It may of course just been a duff valve.

Man made faults can cause incredible confusion. This is the result of replacing too many components in one go. It is a lesson well learned for your next project. Do you still need a 30P4/MR ?
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