[Amps] Bad tubes from Ebay

[Steve Thompson]

> Since there is NO RETURN, he ate the tubes.  Russian Beryllium Oxide is
> tastier than USA stuff, it was probably the added Cherry Flavoring.
>
Just a minor point - I think there's no BeO in these (or most other 
external anode) tubes. The ceramic is Alumina - razor sharp if broken, 
but otherwise harmless.

One exception which you might come across - the output device in the 
Clansman 353 tank radio is based on a 4CX250 modified for conduction 
cooling and the material between the anode and the integral heatsink 
ring is BeO.

Steve