[TCML] Handmade Vacuum Tubes Video: Build A Better 811A Mousetrap?
drieben at comcast.net
Sat Sep 13 07:38:07 MDT 2008
Actually, a partial vacuum DECREASES the breakdown voltage
for a given gap spacing, so you would really be going the wrong
direction with this endeavor. It was brought up in a recent earlier
discussion that a blower (positive pressure) gap would probably
outperform a sucker (negative pressure) gap for this very reason.
Of course, as you also mentioned, removal of excess heat would
also be a real issue here.
-------------- Original message --------------
From: "Neal Namowicz" <neal at imagesbyneal.com>
> 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 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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