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In Reply to: RE: Will this work? Switching from 6.3 to 12.6 volts posted by DAK on June 11, 2017 at 16:52:21
Don't these work by taking AC input and doubling the DC output? You need 12.6 VAC for a 12X4 rectifier.
Good point, hence my question was not only regarding the current loss but also what would be the DCV from running the 6.3vac into a doubler circuit.
You don't need a rectifier. At least, not for the heaters. As long as the source has enough current to handle the heaters of all tubes.
To get 400+ VDC. You start with 6.3 VAC for heater/anodes of the rectifier and at least 400 PIV AC on primary line. Then, rectify it to 400+ VDC. Right?
Hi FL, i was wondering about the feasibility of using a voltage doubler on the 6.3v filament line and getting 12.6 to run 12x4 rectifier. But it was pointed out that i would lose 1/4 of the current in the circuit.
I'm not familiar with how to double 6.3VAC to 12.6VAC. Not without putting another transformer inline.
I don't know if the voltage doubler circuit will exactly double the 6.3vac into 12.6 VDC. Eli, says it won't be that much, but i guess i should breadboard it and see what i get. I have all the parts and i will put it together and let you know. regards.
Like any other fully indirectly heated type, DC on the filament will energize a 12X4's heater, without incident. Of course, AC is fine and DC is "overkill".
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