[Amps] Class C amp for RTTY contesting...

[Tom W8JI]

> Anything with a clamp tube should have been pretty easy to 
> get good. I do recall one commercial tx designed (in about 
> 1946) for on/off keying at speeds up to 150wpm (obviously 
> from a machine): it was keyed in the driver and had a 
> Class C PA of 6 807s in push-pull parallel. Because of the 
> speed, they needed fast rise and fall times to avoid what 
> today we'd call ISI (Inter Symbol Interference). It 
> clicked pretty badly at hand keyed speeds!!
> It would be interesting to see pics of rigs like Valiants, 
> KW1, 32V3 and Rangers though - real radios!

Valiant at:
http://www.w8ji.com/valiant.htm

This is the waveform of a modified unit. A stock unit is 
only a little better than a DX-60.

I'll eventually get some shots of a 775DSP and other rigs as 
they come through here so people contemplating a grid driven 
PA can see what they are dealing with when power is turned 
down to 50 watts or so. It isn't pretty.

73 Tom