To: mail11:;-at-msd26.ENET.dec-dot-com (-at-teslatech)
From: "I am the NRA." <pierson-at-msd26.ENET.dec-dot-com>
Date: Wed, 17 Jan 96 13:49:35 EST
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>I just scrounged two massive ignitron tubes from a salvage yard.
>Manufacturer: Weltronic Ignitron 210-0147 NL-1052A Size C
Bet they are out of a scrapped out resitance welder, maybe. They
used to use em in cycloconverters.
>Anyone familiar with these things?
>I tried digging thru my catalogs, Radio Amateur Handbook, etc., and I can't
>find _anything_ on Ignitrons.
Try looking under 'thyratrons'. Differetn name for the same thing,
as i recall. Also try older books (used book stores) with names
like 'industrial electronics'. Older copies of 'electrical engineers
>I believe they're a rectifier/switch,
Yup. A controlled, mercury vapor switch. (they CAN lose the vapor,
in which case they are no good.)
>and they look like they have a control pin (grid, gate?)
Yup. they are a 'controlled diode'. Need heater power like most
other vaccuum tubes (as i recall). Even with heater power and voltage
across, they need a 'start' signal on the gate. ONCE STARTED THEY STAY
ON. Turning the gate off (usually) does NOT turn them off. (those
familair with older solid state power devices will be saying:
Yep. They act almost exactly like an SCR only MORE RUGGED. In fact
some folk call 'scrs' 'thyristors' from 'thratron'.)
They can be used as synchronous rectifiers, phase control power
Hmmm. I said they stayed on. How Do They turn Off. (like an SCR:
current thru them drops to zero. USUAL application, is on an AC line,
two to do full wave, they get turned on, then turned off as the line
goes thru zero, then turned on again. by delaying the time int he cycle
when turned on, one can control power, etc. (phase control.)
Inside, the gate controler makes (near?) contact with a pool of
mercury (YES. There is an UP side. should be marked.). The control
electrode 'ignites' (not litteraly!!) Pulls a small arc, the resultant
plasma carries the power current, then goes out if the main current
[I am doing this from fading neurons. I THINK its accurate, but there
are a couple of different, tho similar, mercury vapor styles of tube.
They hadnle more power than a vacuum tube, since they use Hg plasma to
carry the current.]
>They are water cooled.
For low powers, could operate without water, for max rated power needs
coolant. Also not happy if over cooled.
>I'm sure I have a good find here, and I think they'd be good for exploding
>wire/water stuff, and maybe as a good rectifier for building a d.c. Tesla
>coil system, but I have no clue as to how to wire one.
I would need to do lots book work & then YOU would need to do the same.
IF they are functional (the Hg can leak out) they can be used. If they
ARE from welding gear (spot, or otherewise) they may have a low
[coincidence is strange department:
YEARS (DECADES) ago, my dad & i got my/our first coil (Model t Coil
primary, etc...) running. I began pestering about a 'big' coil, then
(mid 50s) tube/candlestick coils were the rage. (many hard workers
have since proved otherwise...). Well, turned out we had some
'866 (?) anyway they were small mercury vapor tubes and some old
transformers and we hacked away, based on the tube type plans. And it
would not work. We pondered awhile & then figgered out about the
"stays on" part of the mercury vapor spec. At the time we dropped
it. Now, i could make it work, (THOSE tubes were WAY smaller than
what is discussed above.)]