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[AMPS] 3-500Z amplifiers and grid current

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Subject: [AMPS] 3-500Z amplifiers and grid current
From: (Mike Willis)
Date: Mon, 16 Mar 1998 11:22:13 +0000
How does one estimate the grid dissipation in valves like the
3-500Z, 3CX800 etc. DC Volts x DC amps is simple, RMS volts
and RMS current also easy. But what about RF losses?

Say I have 50W input to a 5-300Z on 6m, cathode biased to 5V
3kV EHT at 400mA and 130mA grid current. What is the grid dissipation?
I know it is not 50W, but it has to be more than the 7W I calculated.
Say there is 200mA of grid current during tune up. How long can that
situation continue before damage occurs?  

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