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Re: [Amps] Schematics  for 4CX250B GG HF amplifier

To: <amps@contesting.com>
Subject: Re: [Amps] Schematics  for 4CX250B GG HF amplifier
From: "Peter Voelpel" <df3kv@t-online.de>
Date: Thu, 16 Aug 2012 03:01:13 +0200
List-post: <amps@contesting.com">mailto:amps@contesting.com>
Amps like that have been common for Swiss (Zellweger) and DDR (RFT)
military.

73
Peter, DJ7WW 

-----Original Message-----
From: amps-bounces@contesting.com [mailto:amps-bounces@contesting.com] On
Behalf Of Bill Fuqua
Sent: Donnerstag, 16. August 2012 02:23
To: g8on@fsmail.net; JeanPierre.Behiels@electrabel.com; amps@contesting.com
Subject: Re: [Amps] Schematics  for 4CX250B GG HF amplifier

Every once in a while we revisit this topic.
I will just cut and paste the following from some time ago.

Bill Orr's article about super cathode driven tube amps in the July 67 QST.
He has a example of a 4CX300A (control grid connected to cathode) cathode
driven amplifier.
It only has a power gain of 5.     375 watts out with 75 watts input. But
the
nice thing is that the 3rd order products were 46db down and 5th were -49.
This is quite an improvement over most amplifiers.
     I have always wanted to do this using two stages one produce around
300watts output and the second 1500 watts.
A 4CX250b driving 4 parallel 4CX250B tubes. Should get similar results.
This naturally would require 50 to 70 watts drive.

73
Bill wa4lav


At 06:31 PM 8/15/2012 +0200, peter chadwick wrote:
>The 4CX250B is not suitable for use in the classic GG arrangement. Go 
>to http://ahars.com.au/documents/eimac01.pdf  for an explanation.
>73
>Peter G3RZP
>

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