Glen,
Why not run the Screen grounded. This is a very acceptable way of running
tetrodes. There is information on the web.
Art
KB7WW
Glenn McNeil wrote:
>
> Hi Guys...
>
> I'm about to start construction for a 2 meter linear using a GU74B (
> 4CX800 ). The socket I have is a military one, with built in chimney and an
> external screen ring. This ring makes contact with the screen area of the
> valve.
>
> At present it has 4 x 1000pf 1kv disc ceramic caps between the screen
> "ring" and ground.
>
> My question....
>
> (a) Is this socket useable at 2 meters
> (b) I note that about 1100pf is usually the screen capacitance in eimac
> sockets for the 4CX250...can I just solder an even number of disc ceramics
> to the socket to total about 1100pf, or am I missing something ??
>
> If the socket is useable at 2 meters, it seems a great way to construct a
> screen capacitor, as it's repairable. The socket is made out of a brown
> bakelite material and has the following written by hand on it :
>
> U 84812006
>
> Regards,
>
> Glenn
> VK4TZL
>
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