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Re: [Amps] Amps Digest, Vol 36, Issue 23

Subject: Re: [Amps] Amps Digest, Vol 36, Issue 23
From: Steve Thompson <>
Date: Thu, 15 Dec 2005 09:30:06 +0000
List-post: <>

Steve Gehring wrote:
> Hi Tom,
> This is certainly an interesting post - good luck with the endeavor!  In the
> early eighties, the USAF was still using the Collins 208U-3 and 208U-10
> amplifiers at their Global Command and Control System sites.  I worked on
> these for a living as a young ham... what a job and a privilege.
> Regarding your post, the 208U-3 was an auto-tuning, 3KW, 2 - 30 MHz
> amplifier driven by 1 volt RMS input (20 mW) from the transmitter box on the
> other side of the transmitter room.  This was accomplished with three stages
> of amplification, a 4CX350 driving another 4CX350, which in turn drove a
> 4CX3000.  This wonderful amp was designed by some genius at Collins, or
> group of them, in the 50's.  They were robust and wonderful.
> Perhaps you could pattern your amp after this wonderful design?  Yours would
> have to include updated components and engineering design principles.
Tom, if you haven't already been there, you'll find interesting reading 
in 'SSB principles and circuits', chapters 12-14 in particular.

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