[Amps] 4CX250 bases

[Steve Thompson]

> As far as I am aware (the data sheets are on my web site) the CCS1 need 
> a BeO base. I guess you could dispense with that if you used a small fan 
> to keep the base seals cool, but if you want to run it silent, I think 
> the base needs to be a special one.
> 
> I have a base and the screen decopuling capacitor is a sepparate unit - 
> another of my many projects that I hope to finish one day.
The conduction cooled '250s I've used (out of Pye airband 
transmitters) had a BeO block between the anode and 
heatsink, but the bases were the same as used for air cooled 
valves, except for the addition of a finned heatsink to help 
keep the grid spigot cool . It was one of the (AEI brand) I 
used in the hipot test.

Steve