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In Reply to: Re: Connecting resistor's value in Triode mode posted by ianm0 on September 19, 2006 at 16:56:07:
That KT-90 was acting up. 520 volts across the tube and 50 ma is a plate dissipation of 26 watts - that's just barely more than 1/2 the rated dissipation.Look through the plate holes (carefully!!) while the tube is running and see if you see the screen wires glowing white in a lot of places. If so, you found the cause of the problem.
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Follow Ups
- Re: Connecting resistor's value in Triode mode - Jim McShane 15:04:45 09/20/06 (0)