Wow! Thanks John, that's some seriously good info. I can see there are
several things to be considered to be able to operate the amplifier
within the specified range and maintain efficiency and linearity. My
aim is to construct an amplifier that can lope along at legal limit. Of
course, I also want to see all those beautiful tubes pumping out the power.
Thanks again!
Rick/K5IZ
John Coleman ARS WA5BXO wrote:
I ran a pair if 304tls in push pull. I think the bias was around 500 volts
and the grid current was around 150ma. I drove it with a pair of 812s in
push pull at about 110 watts drive. The plate supply on the 304s was around
1600 volts and the plate current was 600ma. Output power was 790 watts.
The modulator was four 813s in standard AB2 PPP configuration with 2700
volts on the plates. The tank coil was shortened up and capacitance added
to get the Q up for the low load Z. That was an ether heater....
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