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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