Can you bias a Tetrode off like a Triode with a large resistor in the Cathode?
- Paul
At 02:03 AM 12/30/2013, you wrote:
I agree that biasing the control grid off is better.
Because of negative screen current, an active (rather than VR tubes
or zeners) shunt regulator is best, and not difficult to do,
although the heavy bleed current approach worked.
Question: Why do these modern ceramic tubes show negative screen
grid current under some conditions? What is the mechanism that
causes it? Straight thermionic emission from the screen seems
unlikely, especially as a gold sputter would effectively prevent it.
73 es HNY
Peter G3RZP
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