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cathode follower
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Old 19th February 2004, 10:07 PM   #1
olvrkrg is offline olvrkrg  Germany
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Default cathode follower


my question might seem somehow strange. If I would like to drive the cathode of a broadcasting tetrode tube that only allows a cathode - heater difference of 150V with lets say +/- 1000V, the heater somehow has to follow. Can this be done if I heat with accus and connect + and - of the accu through a resistor - lets say 1MOhms - with the cathode??? So all the accu would have to follow the cathode voltage. Any ideas if this could work??
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Old 20th February 2004, 08:23 AM   #2
Frank Berry is offline Frank Berry  United States
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If the filament is "floating" (not grounded), simply connect the cathode to one end of the filament.
A resistor is not needed.
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Old 20th February 2004, 08:35 AM   #3
AKSA is offline AKSA  Australia
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Another option, not necessary better but certainly isolating, is to connect a high voltage n channel mosfet gate to the cathode, drain to B+ and source to filament, AND a 100K resistor to ground.


Aspen Amplifiers P/L (Australia)
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Old 21st February 2004, 10:49 PM   #4
olvrkrg is offline olvrkrg  Germany
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Does anyone know what it means for an accu to be connected with a signal +/- 1000V at cathode and anode? I only know that this would influence the electric double layer, but I can't estimate how much current I need to heave and drop the potentials. Does anyone know?
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