Re: [TCML] Handmade Vacuum Tubes Video: Build A Better 811A Mousetrap?

["Neal Namowicz" <neal@xxxxxxxxxxxxxxxx>]

Hi Jim,
Thanks! I wish some of the TC parameters were as simple to understand. One 
more question about vacuum, as it might relate to TC's. I've seen and read 
about a lot of different "incarnations" of spark gaps for coils. Has anyone 
ever explored the feasibility of a vacuum gap? I've taken glass tubes, 
connected an electrode in each end and pumped it down to about 20" Hg. 
Running HV through it makes for some very interesting plasma streams, but 
what about using it as a gap? I assume a couple of the biggest hurdles would 
be the rapid build up of heat and the potential for some low level x-ray 
production. But has it been tried? Thanks for the input,

Neal.


> Neal Namowicz wrote:
> > Hi all,
> > Although I've yet to attempt a VTTC (let alone make my own tube!) I've 
> > been curious about tubes, so I've been following along this thread.
> > I'm just wondering; what the heck is a "getter"? I saw the link, so I 
> > thought, ok, now maybe I can figure it out, but that wasn't any help. 
> > Thanks in advance for the info.
>
> A getter is some reactive metal (barium, titanium, etc.) that is deposited 
> on the inside of something you want a high vacuum in.  It's sort of like 
> flypaper or a roach motel for stray atoms. At any

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