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Re: Vacume tube TC
Tesla List wrote:
>
> >From DavidF4797-at-aol-dot-com Sun Dec 8 12:00:28 1996
> Date: Sun, 8 Dec 1996 09:46:18 -0500
> From: DavidF4797-at-aol-dot-com
> To: tesla-at-pupman-dot-com
> Subject: Vacume tube TC
>
> I've been tinkering around with a vaccume tube coil now for several months
> using a pair of 811a's (triodes) and was able to produce a nice 3" brush
> discharge off the top of the coil ( tall thin candlestick variety). I then
> switched to a 4-500z with the intent to produce greater output....
> Unfortuneately, the same circuit doesn't produce *any* brush output, although
> if I get a flourescent tube near to the primary and secondary it lights up so
> there must be output of a sort. I have heard it speculated that the extra
> controll grid in the 4-500z is causing the problem and that what I really
> need is a 3-500z triode.
>
> Does anyone have any ideas or suggestion about this?
One other suggestion.
I don't have a tube manual handy they are at the shop.
If that tube is a tetrode then connect the 2nd grid to the plate. If the
current gets too high on grid 2 then add a resistor.
Any tube will work. You just have to get it right. Keep trying.