[AMRadio] AM Usage with Linear AMPS

John Coleman, ARS WA5BXO wa5bxo at pctechref.com
Mon Nov 22 22:56:39 EST 2004

Hi Brian:

Consider what the efficiency is with no drive.  The tube is drawing
current and has voltage therefore it has input power but no output.
Efficiency is 0%.

As input drive is applied the efficiency increases but so does the plate
current. The trick is to reach the 25% power point (or 50 Voltage point
if monitoring on a scope) with out hitting the spot where the
dissipation is 65 watts / 811A.   

John, WA5BXO

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