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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
I think Triode Kingdom hits the nail. Reducing the input voltage will most likely reduce the DC pluse frequency instead of the output voltage for these type of chopper transformers.
I don't think it will sound the best also at the reduced DC pulse. Why not use a regular 12V SMPS power supplies and reduce the output down to near 10V? I have experienced with them and found they work quite well for the 10V filaments in the Big Transmitter tubes.
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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.
Follow Ups:
I wasn't suggesting a permanent reduction, just a temp one. Doesn't sound like it will work anyway. I am already using smps units on one channel, wanted to try AC on the other to see what difference there might be in the sound.
The units I initially used measured close to 24V pk-pk. At that voltage, nothing too exotic was required in terms of dropping resistors to reduce it to 10V. At 33-34V, that's no longer true. You would need total resistance of about 1.2 ohms and 30W dissipation capability. Do your units have toroidal output transformers, or are they conventional like the ones I purchased? The former would be easy to modify.
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Buy Chinese. Bury freedom.
I actually never checked, but I will. I really want to see if I can hear the AC "difference" in the sound of the amp though. That will be the deciding factor for me, all other things being equal.
"Why not use a regular 12V SMPS power supplies and reduce the output down to near 10V?"
The goal is to heat with AC at an ultrasonic frequency. Quite a few enthusiasts, myself included, have found that AC sounds better than DC heating.
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Buy Chinese. Bury freedom.
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