Big Triode Tubes
Quoting Dan Gowin <gowin-at-epic-1.nwscc.sea06.navy.mil>:
> Having a hard time trying to find those giant high power
> tubes for our Tesla coils. Inspect this sight:
> Apparently these tubes are still manufactured in Russia. I
> found an RCA 811A equivelent in there industrial stocks. They
> also have some tubes that I've never heard of, at huge
While there can be no doubt that the 811A is one of the most
popular tubes for use in CW Tesla coils I have doubts that this
tube is really the best solution. With the increased difficulty
in finding 811A in good condition at reasonable prices it would
seem prudent to find a better substitution. The "unheard of"
tubes sound interesting.
For my first tube coil I am planning on using the rugged and
powerful "light-house" triode tubes typically used in commercial
RF induction heaters. After speaking with an induction heating
engineer I am convinced that these type tubes are all but perfect
for high powered tube Tesla coils.
Try sending for a catalog from: Vacuum Tube Industries, Inc.
506 North Warren Avenue, P.O. Box 2009, Brockton, MA. 02405 USA
tel: 508-584-4500 tel: 800-528-5014 fax: 508-584-0096
They specialize in new and rebuilt 450 KC power tubes for
commercial RF induction heaters and carry a full line of new and
used plate & filament transformers, cooling loops, control
systems, etc.. These people have been very nice to me on the
phone and have a super catalog with many "one-off" rebuilt power
tubes that can be picked up cheaply.
my 2 cents
... If all else fails... Throw another megavolt across it!
___ Blue Wave/QWK v2.12