813 VTTC Problems

["Tesla list" <tesla@xxxxxxxxxx>]

Original poster: "Chris Fanjoy" <zappyman@xxxxxxxxxxx>

  Still trying to get this dual 813 VTTC going, with no luck. The 
main problem right now is figuring out what to do with the extra 
grids (G2 and G3) of the 813 tubes. I didn't have anything to go by, 
so I connected both G2's together and connected them to the 4KVDC 
supply via a large 10kohm resistor, and left the G3's unused. The 
resistor violently exploded the instant power was applied. It's my 
understanding that the G2 of a tube isn't supposed to draw any 
current - so something must be wrong somewhere! I'm suspecting that 
one or both of the tubes may be bad; I'll be doing more tests but 
this time with a Variac, to confirm if this is the case or not.
  How exactly should the G2 and G3 grids of these tubes be connected 
to the circuit? And are they actually supposed to draw current?
  Thanks for any advice.