05-16-2011, 10:22 AM
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Join Date: Sep 2009
Assuming the amplifier could handle it (and it won't) a doubling of source voltage would increase output power by a factor of four. This is just Ohm's law since doubling voltage will also double current into the same load. Keep in mind the output impedance should remain virtually the same under these conditions and that volts times amps is watts.
The 800 watt PEP amp would try and produce 3.2 KW
PEP! Going from 12 to 18 volts should double power at 1.6 KW
. In this situation each volt is producing about 133 watts of extra output. Every watt you try and squeeze out past the 800 will come at the expense of spectral purity due to rapidly increasing IMD. The people you talk to may not notice it but those using frequencies adjacent to yours probably will.
Class AB1 is only given to tube amplifiers because the "1" indicates there will be grid current flowing. The equivalent class of bias for transistors would be AB. The drive suggestions and test for linearity that VA3ES suggests are right on target. The amplifier should only draw about 100 amps. Having 200 amps available is a great idea since it will reduce voltage drop and provide plenty of headroom for the positive peaks.