Re: New VTTC

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

Original poster: "Jim Mitchell" <electrontube-at-sbcglobal-dot-net> 

Hi Mike,

Whoa!!! 4kV to an 811A I DON'T THINK SO!!!!  811As have a max plate voltage
of 1kv or something, and people push them with the 2kv out of MOTs  You will
need a larger tube.  I have some available, contact me off list if you are
interested.  Smoothed DC at 4kv is just asking for a hole in the plate and a
tube arc... Not good!

This has been covered before on the tesla list, do a search and you shall
find.  VTTCs and the like won't produce ozone due to the temperature of the
output.  Something like a low current cascade would work better as an ozone
generator.

To vary the frequency of a classic VTTC, you either change the tank
capacitance, or change the *primary* inductance by tapping the primary at
different turns.  This is usually a one time, set and go thing which you set
at the resonant frequency of the secondary to get the longest sparks.

If you want to run CW you will probably need some serious cooling as
everything will get hot.. and you will need to keep the tube cool.

Yes you most definitely need a separate filament transformer, turning on
filament and B+ at the same time is bad for the tube.  You can wind your own
filament transformer using a de-secondaried MOT core just make sure to test
the output voltage so it corresponds with your tube ratings.


Regards - Jim Mitchell
----- Original Message -----
From: "Tesla list" <tesla-at-pupman-dot-com>
To: <tesla-at-pupman-dot-com>
Sent: Saturday, February 28, 2004 8:24 PM
Subject: New VTTC


 > Original poster: "Michael H Nolley" <nolleym-at-willamette.edu>
 >
 > Hi list--after a four year hiatus from the Tesla list, I am re-subscribing
 > so that I can get help with my VTTC.  I haven't started construction yet,
 > but my goal is something which runs on 4kv smoothed DC and can run CW for
 > extended periods.  My application is an ozone generator. :)
 > I am thinking about dual or single 811As, running at 4kv smoothed DC.
 > Will I need to buy a filament transformer, or can I wind one using a MOT
 > core?  Finally, I would like to be able to vary the frequency easily, so
 > is it possible to vary the capacitance or inductance of the secondary to
 > do this?
 > Thanks for your advice.
 > --Mike N.
 >
 >