Looking for a HV Vaccum Tube Triode

["Tesla list" <tesla-at-pupman-dot-com>]

Original poster: "by way of Terry Fritz <twftesla-at-qwest-dot-net>" <CoolCorals-at-aol-dot-com>

Hello,  I am sort of new to your list.  I have been watching and learning 
from your sites and emails.  Hopefully I will have all of the things I need 
to build my first TC soon.  Anyway,  I have a sort of off the subject 
question for you guys.  You seem to know where to get just about anything 
High Voltage, so here goes.
     I am in need of a Vacuum Tube Triode capable of handling 15KV -at- 30ma of 
pure DC.  I would like to switch, or modulate this with the lowest possible 
grid voltage.  Does anyone know of how to get ahold of one of these, or what 
can be used to replace this nowadays?  Transistor etc?
     I would greatly appreciate any advice you can offer.
     Thanks, The new guy