[Amps] Tube swap

[William Turner]

In my (limited) experience, it seems that ceramic tubes are better at 
keeping their vacuum than glass tubes. Anyone else had that experience?

Years ago, Tektronix changed over from glass CRTs to ceramic partly for 
that reason.

73, Bill W6WRT
ex-Tekkie

------------ ORIGINAL MESSAGE ------------
On 1/27/2014 6:17 PM, Carl wrote:
> The big problem, even with NIB, is the seals leak and the tube slowly 
> goes to air.