Re: whats the largest VTTC?

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

Original poster: "Steven Ward by way of Terry Fritz <teslalist-at-qwest-dot-net>" <srward16-at-hotmail-dot-com>









>Realize, just having the tubes is not enough, you have to in no particular
>order:
>    1. Cool them.
>    2. Power them
>    3. Find _very_ high voltage - high power capacitors capable of continuous
>        RMS tank currents in the 10's or hundreds of RF amps
>    4. Start worrying about primaries catching on fire from thermal rise from
>        RF currents
>    5. Watch for fires caused by collateral induction heating effects around
>        energized primaries and secondaries.
>    6. Prevent primary to secondary breakdowns due to HV used in tank
>
>Building a really large VTTC would be a much more challenging exercise IMO
>then building an equivalent power SG driven TC.
>
>Regards
>Dave Sharpe, TCBOR
>Chesterfield, VA. USA


Im starting to see these problems more and more as im running up to about 
2kw now.  My dual 833A VTTC is having to minor difficulties, to say the 
least!  Luckily im still in the 5kv range.  Primary and secondary coils are 
getting quite warm in a short amount of time.  Im not pushing the tubes 
beyond a slight redness (yet).  My 18A RMS tank cap is getting a few 
degrees warmer than room temp, so thats not good.  Sparks are just barely 
making 20", so somewhat displeasing.  This coils will see many more hours 
of work, im sure.

I was vary interested to read about many of the different tube coils out 
there, and to hear of such extreme power levels!  That is really 
incomprehensible to see a coil running in the 10s of KW!

Oh, and John F was correct, i mean largest coil, spark lenght.  Although i 
still like to hear about the physically large ones.

Steve Ward.