> Joe,what was the filament voltage with that kind of line
> input? Excessive
> filament voltage allows more than normal emission with
> thoriated tungsten
> fils...At least for a while! 73, Jim K7RDX..
Jim,
A single tube will easily make 1200 watts or more with
enough drive at 3000 volts, and you don't have to run the
filament extra hot to do it.
There isn't any doubt at all people are seeing 2kW or more
from a pair when they bang them with 150 watts or more at
3kV or more.
The problem is with claims that a pair in g-g run 1500 watts
or more out with 100 watts of drive and about 3kV on the
anode. It really won't happen, even if you put 10 volts on
the filament. The problem is power gain, and the gain is
largely set by the ratio of cathode driving impedance to
anode load impedance in a g-g amp. The only way to get more
gain is by running more HV so the anode impedance is higher.
73 Tom
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