The "four in line" was four 1625s mounted in line that were grid driven in
push pull parallel arrangement. Each side of the push pull circuit had two
tubes in parallel.
Getting old when you remember this stuff.
73
Gary K4FMX
73
Gary K4FMX
> -----Original Message-----
> From: amps-bounces@contesting.com [mailto:amps-bounces@contesting.com] On
> Behalf Of Glen Zook
> Sent: Thursday, February 12, 2009 12:00 PM
> To: Edwin Karl; amps@contesting.com; Carl
> Subject: Re: [Amps] 1625
>
> The P&H 400 series amplifiers could be ordered with either modified 1625
> tubes or 837 tubes. The "Four In Line" was the ARRL's version of the
> grounded grid amplifiers using 1625 tubes. That amplifier was in QST and
> a couple editions of the SSB Manual.
>
> Glen, K9STH
>
> Website: http://k9sth.com
>
>
> --- On Wed, 2/11/09, Carl <km1h@jeremy.mv.com> wrote:
>
> I still have 4 of those tubes with slices in the bakelite where the
> surgery was performed. They were driven by a 20A to some unknown output
> power on 80-20M.
>
> I believe it was P&H who offered a commercial amp with those tubes.
>
>
>
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