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In Reply to: RE: Careful Vinnie, that's not what I said! posted by vinnie2 on December 03, 2016 at 18:00:44
Well then, you're in uncharted territory. I doubt the reduction in output voltage is a linear relationship to the input. These oscillators work by means of a saturable core transformer. They don't behave at all like coupled inductors. I hope you have some junk 813s you can sacrifice for this experiment.
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Buy Chinese. Bury freedom.
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Well there goes that plan. Now, where did I put that big freakin' resistor?
But how did the 12sn7 filament I had hooked to it survive?
Well, most filaments don't usually burnt out right away even at the higher voltages. Even if the filament doesn't burnt out, you just accelerated the aging of the heater / cathode and the emissions. The heater / cathode may never burnt out even at higher voltages but actually shorten the tube life.
12SN7 heater work fine with 12V so it may be just fine.
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.Thou shall not stand where I type for I carry a bottle of Certified Audiophile Air and a Pure Silver Whip.
If what everyone is saying is correct, it actually had 15 vac on it for a while.
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