[Amps] 3.5 kV 2A REGULATED Power Supply: Schematic ?

[Vic Rosenthal]

Bill L. Fuqua wrote:

>  The bias due to the “grid leak resistor” only exist during
> times drive is applied that is why class C amplifiers in many ham
> transmitters have “Clamp tubes” on the screen grids. They drop the
> screen voltage to limit plate current when drive is not applied
> because the grid bias is non-existent with out RF drive (key up).

This reminds me of my first amplifier, c. 1963.  I used an 813 with a 
6Y6G clamp tube in series with a VR150 gas-discharge voltage regulator 
tube, per the ARRL handbook.  When the clamp drew the screen voltage 
below 150 volts, the VR tube extinguished, dropping the screen voltage 
to zero and almost entirely cutting off the tube.

This system had one great feature for CW:  either because the bias rose 
along with the drive, or because of the VR tube's time constant (or 
both), the class-C amplifier did not sharpen the keying waveshape the 
way a fixed bias amp would.  I've often thought about the possibility of 
designing a modern version of a CW-only class-C amplifier that would 
work something like this.  Class-C efficiency would allow, for example, 
1500 watts output from a tube or tubes with only 500 watts plate 
dissipation.

-- 
73,
Vic, K2VCO
Fresno CA
http://www.qsl.net/k2vco