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Importance of Screen Voltage of Pentode???
Importance of Screen Voltage of Pentode???
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Old 18th September 2020, 07:18 PM   #61
Paul Joppa is offline Paul Joppa  United States
diyAudio Member
Join Date: Nov 2008
Screen voltage sets the maximum current at zero G1 voltage. Many data sheets show plate curves at G1 = 0, at several G2 voltages. If G2 voltage is higher than needed, the screen draws (wastes) more current, risks overheating G2, and enables more spectacular self-immolation and arcing.

There are two main reasons for running plate voltages at or near screen voltages:

1) to save the cost of a G2 supply - a resistor and cap, or a regulator, or a separate supply, whatever.

2) Ultralinear operation with a simple output transformer (no tertiary winding).

Both are economic, not performance issues.
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