New to this reflector.
Hope someone can help me understand tube warm up requirements.
Specifically, What are the necessary conditions for voltages at plate ,
screen and control grid during Warm up for indirectly heated tetrode tubes.
I have seen directions that say no plate voltage during warm up, but some
amps (MLA2500) apply plate voltage and limit cathode current to a few mA by
self-bias during warm up.
What I have in mind for my amp with gu74b (4cx800) is to apply fil voltage
for 3 minutes while screen is at 0v, plate is full on and
G1 is biased to cutoff (approx. -75v).
Is my approach workable?
And
What are the necessary conditions condition for the tub during warm up?..
Thanks in advance for your help
John K4dlx
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