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Old 09-11-2017, 01:20 PM
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DavGoodlin DavGoodlin is offline
Motorola Minion
Join Date: Aug 2011
Location: near Strasburg PA
Posts: 2,839
Originally Posted by Electronic M View Post
One thing I can think of is a weak/dead damper. IIRC when the damper dies the fly can no longer draw plate current from the output tube so the screen grid of the output becomes the 'surrogate plate' for the cathode emission to go to. This unnatural screen current drags down the screen voltage, and strains that resistor.
I really need a good tube tester but that sounds good. Cathode current is only 70Ma, and that resistor was hot. Ill post the results of some tube subs
"When resistors increase in value, they're worthless"
-Dave G
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