On Mon, 13 Oct 2014 13:20:15 -0700, Jim Thompson
wrote:

On Mon, 13 Oct 2014 13:13:23 -0700, RobertMacy
wrote:

On Mon, 13 Oct 2014 13:05:47 -0700, Jim Thompson
wrote:

...snip....

That's OK. If I design it... it _will_ work :-}

Wasn't questioning that aspect, just the "why did he do it this way?"
aspect. and NOT even use vacuum tubes!

Doing some housekeeping of my PSpice symbol library I noted that, in
the past, I created symbols for triode, tetrode, and two pentode
symbols, dependent on number of grid pins that come out, so I'm ready
:-}

...Jim Thompson


I've done tube designs, back when they were the only devices that could
handle 10-20kV

I finally successfully replaced in one location, the high voltage drivers.
Using [Delco?] 1200Vceo NPN transistors and a step up transformer
....inside the loop to remove the characteristics of the transformer. All
to get accurate 5kVpp audio sawtooth waveforms [better than 0.1%
linearity] not bad when you consider those !@#$#! resistors have voltage
coefficients that're out of sight!