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Tubes Asylum Questions about tubes and gear that glows. FAQ |
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Tubes Asylum Questions about tubes and gear that glows. FAQ |
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In Reply to: Re: The early type III . . . posted by mmhifi on June 10, 2004 at 13:19:33:
Looks like ~30 watts of plate dissipation, with a few on the screens. at .5 v/mA, we're looking at about 70 mA and 430 V plate-to-cathode, less if the screens are at significantly lower voltage than the plates...The acid test is over 400 volts on the plates and screen, and 100 mA+ of cathode current. If no hot spots show up on the screens, and one side of the plates doesn't glow, you've got a good tube.
BTW, a few pairs of GE 6550A I have tried at 380 on plate/screen have gotten too hot at less than 35 W of combined dissipation. The good KT90's are not even loosening their ties, or unbuttoning the top button of their shirts at this rate.
regards,
Douglas
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