Will,
Again, electrode voltages of tubes are ALWAYS referenced to the cathode of a
tube, not to ground.
I hope you agree that a 3-500Z draws about 100mA grid-current under normal
conditions.
If you look at the constant current curves of that tube you will see that to
reach 100mA grid current at an anode potential of 3KV the grid must be at
about +40V which are between grid and cathode.
Since the grid is tied to the chassis, you will measure from the chassis to
the cathode -40V.
So even if tied to the chassis and the chassis connected to your station
ground, the grid goes positive to +40V at 100mA grid current
On the Eimac data sheet you will see that as "filament to grid voltage -(V)"
73
Peter
-----Original Message-----
From: amps-bounces@contesting.com [mailto:amps-bounces@contesting.com] On
Behalf Of Will Matney
However, I do not agree that the grid can ever be made positive with a
potential above 0 Vdc. Also, who's everyone? I've only seen two people
saying a grid could be positive.
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