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Proud Mary

Sat Mar 07 2009, 12:20AM

Registered Member #543 Joined: Tue Feb 20 2007, 04:26PM
Location: UK
Posts: 4992

Dr. Kilovolt wrote ...

Harry wrote ...

My new Hydrogen Thyratron FX297

compared with Raytheon 811A and box of matches.

Anode Peak Inverse Voltage: 25kV
Peak anode current: 500A
Rise time: 2500A/us
Peak grid current: 1A/1kV/us

Heater: 6.3V/21.5A

1236373279 543 FT6000 Hydrogen Thyratron Fx297

Could these be used for a VTTC? I saw one on local auction pretty cheap, I believe it was bigger (taller) than yours...

Speaking of big glass, here's "the bulb", more likely a balloon, made by...TESLA!

Certainly could drive a pretty big coil with a hydrogen thyratron at 500A peak anode current!

Your 'bulb' looks like a mercury vapour type. Oddly enough, I bought a couple of 866A mercury vapour rectifiers the other day - which can go to 1 amp at 10kV PIV - because I thought the brilliant violet glow would go nicely with the thyratron while supplying power to the pulse forming line.

Dr. Dark Current

Sat Mar 07 2009, 10:44AM

Registered Member #152 Joined: Sun Feb 12 2006, 03:36PM
Location: Czech Rep.
Posts: 3384

Harry wrote ...

Certainly could drive a pretty big coil with a hydrogen thyratron at 500A peak anode current!

Your 'bulb' looks like a mercury vapour type. Oddly enough, I bought a couple of 866A mercury vapour rectifiers the other day - which can go to 1 amp at 10kV PIV - because I thought the brilliant violet glow would go nicely with the thyratron while supplying power to the pulse forming line.

Crap, I nearly bought it (for equivalent of $5, the seller obviously didnt know anything about it), but I didn't know if it would work for a VTTC...

Yes it is a high-pressure mercury discharge lamp. Here it is lit, its a bit bright...

(sorry for the poor quality it's a video frame capture)

Proud Mary

Sat Mar 07 2009, 11:06AM

Registered Member #543 Joined: Tue Feb 20 2007, 04:26PM
Location: UK
Posts: 4992

In the UK, at least, mercury vapour rectifiers like 866A are worth their weight in gold if you can find them still in unopened boxes, or in nice used condition.

The brilliant violet glow would look very far out with a show-case style VTTC.

Steve Conner

Sat Mar 07 2009, 11:32AM

Registered Member #30 Joined: Fri Feb 03 2006, 10:52AM
Location: Glasgow, Scotland
Posts: 6706

Richard Hull built a hydrogen thyratron VTTC way back in the 80s, and a few others have done it since. Our own Chris F. tried it but got stuck on some detail of the control circuitry, I can't remember what.

Chris

Sat Mar 07 2009, 11:40AM

Registered Member #8 Joined: Thu Feb 02 2006, 04:34AM
Location: Harlowton, MT, United States
Posts: 214

It was the optical signal emitters, Conner. The TOSlinks did not work at DC. My thyratrons are CX1622 and look pretty just like the one at the top of this thread, and I was going to run an anti-parallel pair. I was so close to finishing too; I had the 555 based controller working perfectly and made this crazy isolation transformer for all the filaments and drivers, but I'm afraid I don't have the interest to pick it up again. You guys better not tempt me to either, cause I've got way too much else going on to worry about a project like that!

Someday though...

Steve Conner

Sat Mar 07 2009, 12:02PM

Registered Member #30 Joined: Fri Feb 03 2006, 10:52AM
Location: Glasgow, Scotland
Posts: 6706

*prods Chris with a Tempt-O-Tron

Didn't someone here find Toslinks that worked at DC?

Chris

Sat Mar 07 2009, 12:43PM

Registered Member #8 Joined: Thu Feb 02 2006, 04:34AM
Location: Harlowton, MT, United States
Posts: 214

They did, and it was almost too tempting to get some and continue the project... but alas. Fortunately I don't remember the part number.

Mads Barnkob

Sat Mar 07 2009, 01:11PM

Registered Member #1403 Joined: Tue Mar 18 2008, 06:05PM
Location: Denmark, Odense C
Posts: 1968

The worst head crash I have ever seen on HDD I took apart.

Proud Mary

Sat Mar 07 2009, 01:50PM

Registered Member #543 Joined: Tue Feb 20 2007, 04:26PM
Location: UK
Posts: 4992

My own simple plan is to use a Rayleigh PFN. The trigger pulses are to be generated by a small thyratron stepped up to 2kV and sharpened by a mesh series, all very 1950s, I suppose.

If I can make this run at medium power, I've always wanted to have a go at using a coaxial PFN, which has always interested me.

I hadn't been thinking of driving a Tesla with it, as there are a thousand folk who know far more about coils than I ever shall, but am looking for some exciting pulsed power applications that other experimenters hadn't perhaps thought about.

Hon1nbo

Sat Mar 07 2009, 11:02PM

Registered Member #902 Joined: Sun Jul 15 2007, 08:17PM
Location: Pacific Northwest USA
Posts: 1042

here are some pics of the Triggered Spark Gap Assembly that I built in a few minutes last night for a Pulse bank I am building... the item I am holding at the end with the grey output is a Pulse Transformer unit from Information Unlimited... got it several years ago... I plan to use wither that, or an Ignition Coil for the trigger spark - likely the ignition coil so that I do not need to plug into mains or modify the pre-made pulse assembly

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