Mark,
Try the 1987 ARRL handbook. The 2x4-400 amp is described on page 30-40.
Title "An economy 2 KW Amplifier"
I built mine (2 tubes) from scratch in 1979. I switch sections of
BC-610 RF coils for the Pi network and it covers 80-10M.
Its still plugging along.
The 4-400 tubes are rated to 110 Mhz, so it can be configured for 6M.
73s de Jim
W5IFP
> -----Original Message-----
> From: Amps [mailto:amps-bounces@contesting.com]On Behalf Of Mark
> Beckwith
> Sent: Wednesday, March 20, 2013 11:34 AM
> To: amps@contesting.com
> Subject: [Amps] Anyone recognize this amp / circuit?
>
>
> I have acquired a homebrew amp as follows:
>
> It has two 4-400s in parallel in grounded grid (with a hole for
> a third one,
> FWIW). The bandswitch has positions 80-40-20-15. It has TWO
> 30A Filament
> transformers with 110V primaries wired in series with the outputs in
> parallel. Input is not tuned.
>
> HV power supply is separate, outboard.
>
> This seems like something I might have seen in an old handbook?
> Does it
> ring a bell for anyone in this group?
>
> Fun project. Any conjecture about how I would fare adding 160,
> 15 and 10
> meters?
>
> Thanks in advance for any posts in response.
>
> 73 - Mark, N5OT
>
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