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How small can a VTTC be?

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LAN_403

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Wed Apr 11 2007, 11:13PM

Registered Member #56 Joined: Thu Feb 09 2006, 05:02AM
Location: Southern Califorina, USA
Posts: 2445

I wouldn't put any reqs on the power supply, I would quite like to see someone get a offline or multiplied mains driven coil...
I would just say that it has to spark at least 10% the length of its secondary, with at least a 50% duty cycle. The one with the smallest volume (calculated as the smallest cube the coil coult fit with no parts hanging out, save for the power cord which will run off 120v or 240v mains) wins.

But, be very cafeful as the worlds smallest sstc thread had more flames about reqs than did posts about coils...

Refardless, I submit my old 811a coil

She is 8x8x12" and produces 4-5" of spark.

ragnar

Thu Apr 12 2007, 03:28AM

Registered Member #63 Joined: Thu Feb 09 2006, 06:18AM
Location:
Posts: 1425

I don't have any valves, =(
May I post a solid-state coil? hehe
Matt

Ken M.

Thu Apr 12 2007, 03:49AM

Registered Member #618 Joined: Sat Mar 31 2007, 04:15AM
Location: Us-Great Lakes
Posts: 628

Don't worry BP I don't have any either, and whats worse is I still don't quiet understand how these coils work

Steve Conner

Thu Apr 12 2007, 10:06AM

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

Jeez, that 811A does not look happy. How long did it last, 5 minutes? half an hour?

...

Thu Apr 12 2007, 02:17PM

Registered Member #56 Joined: Thu Feb 09 2006, 05:02AM
Location: Southern Califorina, USA
Posts: 2445

meh, they're supposed to look like that

Actually the tube is still doing fine after a few hours of run time, however the mot I was using (pretty big one, probably from a 1.5kw microwave) was smoking enough to set off my smoke alarm after 1/2hr of running even with 2 fans blowing on it. I am not sure if it was because it was saturating (using 1/2wave rectification) or just too much power being sucked through it (she draws almsot 15 amps!) but I need to build a stataco for it. Or tune it better...I also want to go back to a voltage doubler on the mot (That was working fine with 2 811a's in parallel, but when I switched over to 1 it was too much for it)

Marko

Thu Apr 12 2007, 02:31PM

Registered Member #89 Joined: Thu Feb 09 2006, 02:40PM
Location: Zadar, Croatia
Posts: 3145

Peter: I don't know how you managed not to set things on fire there... You are dumping 1700 watts into a tiny coil and small tube!

I was pumping 100W in a coil of similar size and I still had trouble removing all the heat and keeping a mosfet cool even when interrupted.

uzzors2k

Thu Apr 12 2007, 03:34PM

Registered Member #95 Joined: Thu Feb 09 2006, 04:57PM
Location: Norway
Posts: 1308

I never thought this thread would be so popular. Since there seems to be some interest I'll make some rules, and you can start competing.

Rules are what Shawn proposed.

ShawnLG wrote ...

1. It must be a tesla coil (air core resonance) driven by a vacume tube(s) of choice.
2. The VTTC must be able to break out a secondary arcs or corona discharge.

Coils are to be judged on total size and breakout. Total size not including the power supply, but everything else used to make it run. Otherwise everything else is allowed. In a ?month? or so we can vote for best coil, something like Steve Conner's Ambient Energy LED lighting contest My thread, my rules, and any discussion of the rules is off-topic so don't waste time on it.

Vaxian wrote ...

I would be willing to build a neato trophy for the winner.

The prize will be provided by Vaxian if he stills wants to make one. You're free to join in on the coiling too, Vaxian.

Peter already has a head start so get started!
Let the coiling begin!

Vaxian

Thu Apr 12 2007, 04:50PM

Registered Member #635 Joined: Tue Apr 10 2007, 01:56AM
Location:
Posts: 85

I agree, got to thinking about it and what is small about a MOT!

I think it should also be able to maintain the breakout for a reasonable time too, anyone can blow up a tube.

Also the coil must contain all components onboard including power supply.

any more suggestions?

Brett Miller

Thu Apr 12 2007, 07:49PM

Registered Member #593 Joined: Tue Mar 20 2007, 12:32AM
Location:
Posts: 50

Vaxian wrote ...

You can achieve breakout with a 6146.
Brett Miller got 1.5" from a 3C24 (looks very similar to the last tube in the Ch r's last post)
He did this with just a mockup of junk jumpered together across a desk. I imagine much better results can be gotten with experimentation.

Uh, try to keep that in context Dan, I was not trying to make sparks with that setup...I did not even tune or have any taps on that experiment...I was mainly just testing out those surplus little micas I got from you. I think you could get 5 or 6 inches with such a tube (3c24) with the proper design. It looks like Chris Hooper has tooled up for such a thing already. My advice on the 3c24 would be to make sure and tune at less than full voltage. That plate cannot handle being in the bright orange/yellow-white temperature for very long. It will melt eventually.

-Brett

ShawnLG

Fri Apr 13 2007, 02:38AM

Registered Member #286 Joined: Mon Mar 06 2006, 04:52AM
Location:
Posts: 399

I got my VTTC working but no light.

There is so little voltage developed in the secondary that it will not light up a neon bulb when touch againts the topload. It is not possible to make a coil break out in CW mode with very little power. The secondary will not go to waste, I really had winded it for my mini SSTC. At least I now know the resonance frequency required when designing it.

Primery: 9 turns
Secondary: ~425 turns
resonance: ~2.8mhz

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