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Old 28th February 2009, 05:30 AM   #21
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Quote:
Originally posted by athos56
Ok how about this, 1k on gate and screen. Now, for the leg to the VR tubes, would you calculate the resistor like normal to set the current through the tubes?
Yep, since FET's gate does not draw a current at all.
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Old 28th February 2009, 05:42 AM   #22
athos56 is offline athos56  United States
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Sweet, I'll give this a try.
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Old 28th February 2009, 02:41 PM   #23
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I've used this design with good results for a screen grid regulator.

http://www.antiquewireless.org/otb/resto0504.htm
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Old 28th February 2009, 03:09 PM   #24
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Wouldn't it be better to bias the Mosfet with a resistor from source to common, so that it always conducts some current?

Sheldon

edit: speaking of VR tube with follower here.
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