1st,
voltage squared divided by resistance equals power.?
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2nd,
The Eimac formula for grid dissipation is:
Pg=Vgc X Ig
where Vgc is the peak positive grid to cathode voltage
and Ig is the DC grid current.
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example:
100W X 115 = 11,500 and extracting the square root = 107.2V RMS.?
107.2 X 2sq (1.4) = 150V?
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150 X 0.2 =30 and so 30W of grid dissipation I¡¯d exceeding Eimac 20W of grid dissipation by 50%.?