Re: 304TH vs 833A?

To: tesla-at-pupman-dot-com
Subject: Re: 304TH vs 833A?
From: David Trimmell <davidt-at-pond-dot-net> (by way of Terry Fritz <twf-at-verinet-dot-com>)
Date: Sun, 25 Apr 1999 10:31:35 -0600
Approved: twf-at-verinet-dot-com

A 304TH should be good for a tube coil project, but is not quite as
powerful as a 833. I have been able to get a 16 inch spark from a single
304TH, see my past post on the subject "304TH Tube Coil and Level Shifted
supply", posted on the 19th of April, I think. I am not familiar with the
304H. I do know that the 304TL is a higher mu tube than the 304TH, or is it
the other way around? Can't remember right now, as its after midnight :>)

If the 304H looks like the 304TL then it is probably of the same ratings:
3000V plate with 300 watt dissipation, it also can be conveniently wired
for either 5 or 10 volts for the filament. Two of these tubes should get
you over 20 inch discharge, quite easily. Try the "Level Shifted" approach
to feeding the plate, as first introduced by Dave Sharpe of the TCBOR, and
well used by John Freau, RWS, and others on the list.

Good luck,

David Trimmell

At 03:44 PM 4/23/99 , you wrote:
>Original Poster: "Richard Staron" <rstaron-at-aracnet-dot-net> 
>
>Hello everyone.  Seeing all the notes flying around about using an 833A, I
>was able to find a tube in my
>junk box and had tried it out at Robert Stephens place last year.  However
>we found that the tube was
>soft and I put the idea of putting together a coil using that tube on the
>back burner until I was able to get another tube.
> 
>I know have stumbled upon some other tubes and I was wondering whether the
>the 304H and 304TH could
>be used instead of the 833A?  If they could be used, does anyone have any
>schematics or design concepts on using this type of tube.  I would be
>getting these tubes and associated hardware in exchange for some other
>stuff in my junk box..............isn't it great being a bit of a pack rat
:) !
> 
>Looking foward to any replies
> 
>Richard - VE3FAC
> 
>2       Gammatron  304H    serials 2995 and 11652
>1       Eimac    304TH (no serial number found)
>3       connectors for anode pins
>3       holddown brackets  with grid caps
>3       tube sockets
>
>
>
>