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The power supply, voltage and current rating of the high voltage transformer will determine the  output power.


 A lower dead key will not use so much current thus you may see so called more swing on the meter but the avg power out will be the same .


I like the 1:4 method mentioned whatever the carrier/deadkey is the max output or swing should be 4 times the amount of the deadkey.  Clean in clean out.


This 1 watt carrier swinging to 40 watts sound like shit, add a class C  splatter box and you cover 10 channels either way.