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Directly Heat Triode Filament Supply Issues
In a DHT the cathode is also the filament so both heating current and signal voltages are present. Common perceptions : AC=good but noisy, DC=quiet but cold sounding and has glare
What is needed :
1. low noise heating current (ie low ripple and no high frequency hash)
2. no intermodulation between signal and heating current
3. no audio signal loss through heating current device
A negative bias voltage is needed to prevent runaway current in a vacuum tube. The negative voltage can be applied to the cathode or to the grid.