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In Reply to: RE: tried both methods posted by RayP on January 20, 2017 at 17:19:19
Ray are you biasing the gm71 tube at 95ma?
if so what would be the life expectancy? I am curious to bias my gm70 there also
Lawrence
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So far I have kept the current at less than 100 ma. It's easy to adjust using the Powerdrive circuit and the main limitation is what current your output transformer can handle.
The GK71 pentode has a plate dissipation of 125 watts and 576 volts times 95 ma is only 55 watts. I suspect some would suggest that I raise either VDC and / or current to get more power, but I don't need to.
ray
I just adjusted mine LOL took some of the led's out in series now biasing 97.5ma about 119watts plate dissipation
you can hear an improvement it just sounds better to my ears
this is why I love breadboards :)
now the question would be how many hours will the gm70 tube last at this dissipation???
Lawrence
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