Help ID'ing Homebrew Amp.

Dennis Wade sacramento.cyclist at GMAIL.COM
Sat May 27 21:57:59 EDT 2006

And now I see I forgot to describe the final sockets....good grief....

        They are 7 pin with no index fact I don't know how,
by looking..the tubes go in just one way..maybe the pin spacing is
different enough, but I can't tell by looking at the empty sockets.

       Sorry about the disjointed emails....


On 5/27/06, Dennis Wade <sacramento.cyclist at> wrote:
> Please excuse me...somehow this got sent before I was continue...
> On 5/27/06, Dennis Wade <sacramento.cyclist at> 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

Dennis L. Wade
Carmichael, CA

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