Help ID'ing Homebrew Amp.

[Dennis Wade]

No, not 8...7 pin.

Are you suggesting that any input tuning might have been on another
chassis?  Interesting...

          Dennis

On 5/27/06, Rick Brashear <rickbras at airmail.net> wrote:
> Are they 8 pin sockets?  It sounds to me like a grounded grid of some
> kind and likely it is only the final and supply of a larger setup.
> Obviously, the tuned circuits were in another portion of the
> amplifier.   Of course, that's just my two cents worth.
>
> Rick/K5IZ
>
>
> Dennis Wade wrote:
>
> > Please excuse me...somehow this got sent before I was done....to
> > continue...
> >
> > On 5/27/06, Dennis Wade <sacramento.cyclist at gmail.com> wrote:
> >
> >> Good Evening,
> >>
> >>        At a recent hamfest, I found what appears to be a homebrew RF
> >> power amp.  There is a choke input power supply, and by the ratings
> >> I'm expecting about 1.5 KV at around 300-400 ma.  There is a tank
> >> assembly, and a plate choke on the top of the chassis that is pi
> >> wound, appears commercial.  The power supply uses 2 816's.  The final
> >> tubes, are..of course missing.
> >
> >
> >         There are 4 positions for the final tubes.  The input comes
> > from the UHF coax connector and goes right to each of the 4 sockets
> > with an RFC to ground.  No filament choke, no input tuning of any
> > kind.
> >
> >         There are 3 pins of each socket tied together and grounded on
> > each socket.  Filiment power appears to be 12.6 volts fed directly
> > from a transformer in the power supply end of the chassis.  A cathode
> > driven amp?
> >
> >         Power output is taken from topside plate network and fed back
> > under the chassis and a loading cap to another SO-239 (can this
> > arrangement be stable..output and input both under chassis?).
> >
> >         I can take pics of whatever someone wants to see if it would
> > help.  Any thoughts?
> >
> >           Thanks,
> >
> >                Dennis
> >
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>
>


-- 
Dennis L. Wade
KG6ZI
Carmichael, CA

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