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RE: I have biased tubes in the past above true ground but. .

I assume you are connecting pin 2 to pin 1 to make a DHT? Your tube bias voltage is going to be measured as the difference between Pin 3 and Pin 4. I don't know what tube this is, but the bias of these types of tubes is generally done from a grounded grid. If you "bias up" the filament to 20 volts over ground, you will have to adjust the grid voltage up to get the desired operating point.

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  • RE: I have biased tubes in the past above true ground but. . - Chip647 15:23:45 10/25/24 (0)
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