Re: Has anyone built a VTTC with an 810 tubes?

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

Original poster: FutureT-at-aol-dot-com 

In a message dated 3/2/04 1:27:46 AM Eastern Standard Time, 
tesla-at-pupman-dot-com writes:

Tom,

Many tubes types behave similarly in a tube coil.  In my standard
small VTTC, I've tested various tubes.  The 833A, 845's, 810, 813,
300HF, 200HF, etc, all gave similar spark lengths of about 19"
with a single tube.  I didn't alter any of the component
values when using the various tubes for these tests.  Possibly a slight
alteration in values may have provided some benefit.  Generally
the grid leak resistor will be somewhere between 1500 ohms and
12,000 ohms.  It's helpful to use an adjustable resistor, or have
a selection of resistors available.  Steve Ward has some VTTC
math at his website.  His site can be accessed from my site at:

<http://hometown.aol-dot-com/futuret/page3.html>http://hometown.aol-dot-com/futuret/page3.html

John



>I have just aquired a pair of 810 triodes.  I would
>like to put them into vttc service.  I am having
>trouble finding info on the math involved in designing
>a triode based vttc.
>
>I was thinking about using this schematic.
>http://209.210.231.220/webdoc2.htg/Tube_coil/304TL.htm
>I would like to know how to ajust the various l anc c
>and r values so i can use 810's insteas of 304tl's.
>Any help would be appreciated.
>
>Thanks
>--Tom
>