[R-390] 9-Pin Tube Base Specifications

[Tim Shoppa]

"Barry" <n4buq at aol.com> wrote:

> Can someone point me to the physical characteristics of a 9-pin tube base?
> I'm interested in the pin diameters and the pin-pattern's diameter.  I think
> this is in the R390A CD, but not sure.  I figure the specification is
> somewhere on the internet but I'm not finding it.
>
> Thanks,
>
> Barry - N4BUQ
>
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I don't know what the official spec is, but the pins of a 9-pin tube
fit just perfectly into a 1/2" socket (square or hex).  And the pins
themselves are the same thickness as 18 gauge wire (0.040" diameter).

So the centers of all the pins are on a circle 0.460" diameter.

I have looked for an official spec on the web but never found it,
never did find it in a tube handbook either.

Note that most PC mount tube sockets have a different pattern
diameter (usually on the outside so larger).

Tim.