[Amps] multiple supplies in series

[John Lyles]

The Continental supplies do this, and also can switch on and off at 70 Khz or so, so as to be able to recreate audio voltage at the anode of a PA tube.This does high level plate modulation. 

I'm working with one that will make 45 kV, at 40 Amps, without handling audio control voltage. It is strictly the plate voltage power supply. It has 96 x 1.2 kV modules stacked in series. The big transformers each have multitude of isolated secondary windings. Some are turned off at all times, but the exact modules that are 'zeroed' move around the circuit. Four transformers each about 6 feet long, 5 feet tall, with 24 windings on each one. Primary voltage is 4160 VAC three phase. It is a big power supply, walk in with chain link fencing around it. 

73
John 
K5PRO

> Message: 2
> Date: Sun, 12 Apr 2009 13:59:25 -0400
> From: "Jim Tonne" <Tonne at Comcast.net>
> Subject: Re: [Amps] Power supply question
> To: "Alex Eban" <alexeban at gmail.com>, "'Mike Saculla'" <fqm at msn.com>,
> 	"'amps at contesting'" <amps at contesting.com>

> Alex wrote in part:
> 
> > Peter Dahl, designed for me a PS transformer with 
> > 6 separate secondaries, each one producing 400VDC after
> > rectification. 
> 
> What a beautiful candidate for a pulse-width modulator for
> AM or Kahn-method SSB!  That is precisely what the
> 500 kW shortwave transmitters by Continental do.  48
> separate 700 volt supplies, all stacked in series.  Each
> such supply has its own pulse-width modulator.