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Grid-leak resistor



Hi, 

I'm building a vacuum tube tesla coil using four 811A's in parallel.
How can I calculate the value of grid-leak resistor?

I'm looking for "bathtub" or "doorknob" -type mica or ceramic RF capacitors. 
Where can I get them?

I'm also looking for threaded ceramic insulator about 1-3/8" long and
four standoffs about 1-1/2" long. 



Regards, 

Tero Ranta

Vacuum Tube Tesla Coil Page:
http://www.icenet.fi/~dixie/