[Moon-net] Looking for 7289 or 2C39AW tube

[DW Harms]

Moonnet de PA2DW,

I am buidling up a small 23 cm EME setup and have a watercooled cavity amp
that makes abt. 160W. The tube however has arcing problems...
It is a 7289 tube, but a 2C39AW would also work fine. Point is that I need a
tube with a small diameter screw in the cooling-head (I have a lot of 2C39
with a larger diameter screw...) so that it fits the watercooling jacket.

Who can help?!

VY 73, Dick PA2DW