Re: Vacuum Tube Database; looking for 811A coil design

["Tesla list" <tesla@xxxxxxxxxx>]

Original poster: FutureT@xxxxxxx 

In a message dated 12/4/06 5:10:53 PM Eastern Standard Time, 
tesla@xxxxxxxxxx writes:

> So .. anyone know where to find said tubes, plate connectors,
> sockets, and VTTC schematics these days? Are 811A's even a good tube
> to work with? I've seen other tubes discussed here..
>
>   -- many thanks,
>
>    David Small


David,

The 811A's are OK if you are aiming for relatively short sparks.
But for serious sparks, it's a good idea to use more powerful tubes.
I often use the 833A or 833C tubes.  The "C" tube has a graphite
plate for greater power handling.  There are a number of tubes
that work well in VTTC's.  I've used the 810, 845, 4-125A,
4-250A, 4-400, HF300, 5868, 803, 813,etc.  The 4-1000A, and 3-500Z,
and 3-1000Z are good tubes too.  Basically look for a high power,
high voltage triode.  Tetrodes and pentodes work too but may not
be quite as reliable.  The tubes can be placed in parallel if they
are of the same type for greater power handling.  Use staccato
for special effects and longer sparks.

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

click on VTTC's,  various pages and projects.

John