Help ID'ing Homebrew Amp.

[Rick Brashear]

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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