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Tube DIY Asylum Do It Yourself (DIY) paradise for tube and SET project builders. |
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Tube DIY Asylum Do It Yourself (DIY) paradise for tube and SET project builders. |
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In Reply to: UNBALANCED TRANY posted by JAITI on November 9, 2006 at 05:40:09:
How far off is it? If it happens to be 6VAC, you could connect the centertap to the top of the heater supply, but the heater supply nees to be phased correctly to get the error to cancel out.Or insert some resistance in the higher voltage leg of the high voltage secondary. Between the secondary and its plate of the rectifier tube. Figuring the value of this resistor isn't as straightforward as it might seem. The rectifier only conducts current at the top of the AC line waveform. Something like 5x the nominal B+ current supply load. Which means the resistor value should be about 1/5 that calculated by a steady B+ load current and desired voltage drop. And be prepared to change it to get it exact, trial and error.
Ideally the rectifier tube's filament supply should have a centertap, so each plate sees the same voltage to its section of the filament on its respective side of the AC waveform. Many supplies don't have this, but the imbalance is only about 2 volts.
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