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Registered Member #89
Joined: Thu Feb 09 2006, 02:40PM
Location: Zadar, Croatia
Posts: 3145
Desmogod wrote ...
Found this while looking at 811A coils.
Yep, and another one that can't acheive a breakout...
It's good if it actually steps up voltage by few hundred percent instead of stepping it down.
One interesting thing that could be done is maybe an electronic-driven VTTC, that could take feedback from secondary and work like a normal SSTC (Primary LC is optional).
Already seen only on monster 6676 tube based coil, I think.
Registered Member #75
Joined: Thu Feb 09 2006, 09:30AM
Location: Montana, USA
Posts: 711
Chris, those tubes under UV light look really sweet. I wonder if you could put a small UV LED in a finished VTTC and have it glow like that during operation
Registered Member #139
Joined: Sat Feb 11 2006, 11:01AM
Location: Perth, Western Australia
Posts: 358
Firkragg wrote ...
Yep, and another one that can't acheive a breakout...
If you had actually RTFA, it clearly states that ...
"The approximate power output is 35 watts, and the unit is capable of generating a brush discharge of approximately one inch in length. Normally, a small brass knob is attached to the top of the coil so that spark breakout is inhibited. In this case, considerable R.F. energy is generated, and luminous tubes (e.g., neon, argon, xenon filled gas tubes) can be readily ionized and caused to glow while held in the hand several feet away from the coil. This provides an opportunity for considerable study in a relatively safe operating environment, compared to most tesla coil systems."
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.
The 3C24 is a pretty small tube and can handle MOT voltage with no problem. The problem is finding one, I have one, I may just try a Mini VTTC.
Maybe we should have a bit of a competition?
I see myself searching out the smallest MOT, winding a puny secondary with 30+ awg, scrounging my boxes for puny parts...
Registered Member #30
Joined: Fri Feb 03 2006, 10:52AM
Location: Glasgow, Scotland
Posts: 6706
Haha, if you can get enough power from a nuvistor to make a Tesla coil break out, I'll eat my hat. Nuvistors are UHF preamp tubes designed to run a milliamp or two of plate current at 250V.
I have three 6146s kicking around, I guess I should really try paralleling them to drive a VTTC.
Registered Member #286
Joined: Mon Mar 06 2006, 04:52AM
Location:
Posts: 399
"I propose the coil use a single MOT for power no doubler Do we choose a tube like the 6146 or all use whatever?" A MOT is way too big for a small VTTC.
The rules should be simple: 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.
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How small can a VTTC be?
