If W6NQ is correct and the 8874 uses the same socket as the 8873 then the
3CX800 will fit also since it uses the same socket as the 8874.
just another option for a nice little amp.
lane
Ku7i
----- Original Message -----
From: W6NQ <w6nq@rfparts.com>
To: <amps@contesting.com>
Sent: Monday, December 13, 1999 8:29 PM
Subject: Re: [AMPS] SB-230 re-tube?
>
> You might also want to look into another version of the 8873, which is the
> 8874/3CX400A7 triode. It uses the same socket as the 8873.
> No screen supply required. Modification for air from the bottom is
> required.
>
> If considering a conduction cooled version of the 4CX250B,
> look at the 8560A/AS (Eimac & Svetlana).
> One of the Svetlana low cost tube sockets (SK2A @$10) should mount easily.
> Regards, Merit W6NQ
>
>
>
> > Seriously, the effort you put in to replace the tube with an air cooled
> tube
> > could be put into finding a used replacement. If you are determined,
you
> > could use the conduction cooled tetrode version of the 4CX250 and then
> > install a screen regulator circuit and continue to drive cathode, ground
> > control grid for rf, bias tube, and use screen voltage.
>
>
>
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