[Amps] 100 KW probably on 27.025?

[John Lyles]

Its not a 4CX100,000E though, its a 4CW100,000E. Maybe he will run it 
air cooled!

Biggest in the world? What?

He hasn't seen commercial HF amplifiers and transmitters that use tubes 
requiring cranes. At work I built a push pull HF amplifier 27 years ago, 
using pair of TH555A, 200 kW tetrodes. Although it is pulsed and not 
continuous carrier, it has the same 15 kV plate voltage, 1250 volts on 
screen, I chose not to use the 4CW150,00E at the time, had two of them 
plus new sockets. The TH555A have pyrolytic graphite grids. It has run 
all these years, at a single freq of 2.795 MHz. The tubes are running 
class A, pulsed, BTW. Quiescent plate current during the pulse is 40 
Amps each tube.

73

John

K5PRO

> Message: 1
> Date: Wed, 18 Sep 2024 11:59:12 -0400
> From: "Chris Smart \(ve3rwj\)"<ve3rwj at winsystem.org>
> To:<amps at contesting.com>
> Subject: [Amps] 100 KW probably on 27.025?
> Message-ID:<01e701db09e3$b4e16c60$1ea44520$@winsystem.org>
> Content-Type: text/plain;	charset="us-ascii" https://www.youtube.com/watch?v=jbD0wEPVv3s Message: 2 Date: Wed, 18 
> Sep 2024 12:36:50 -0400 From: "Mike McCarthy, W1NR"<lists at w1nr.net>
> To:amps at contesting.com
> Subject: Re: [Amps] 100 KW probably on 27.025?
> Message-ID:<8d9b47fe-a086-4b74-94d3-328da307f5a3 at w1nr.net>
> Content-Type: text/plain; charset=UTF-8; format=flowed
>
> A 4CW100,000E draws more than twice the ham legal limit, 3300 watts,
> just to light the filaments.
>
>