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4hv.org :: Forums :: Tesla Coils
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8Kva Quad 833C VTTC

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...
Wed Nov 28 2007, 03:52AM
... Registered Member #56 Joined: Thu Feb 09 2006, 05:02AM
Location: Southern Califorina, USA
Posts: 2445
!sad

Have you considered like adding some nice big rubber tires or something as to avoid tearing it apart? A little winch on the front to get it up the ramp wink

Good luck!
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Dr. Drone
Wed Nov 28 2007, 05:20AM
Dr. Drone Registered Member #290 Joined: Mon Mar 06 2006, 08:24PM
Location:
Posts: 1673
shades
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Zum Beispiel
Wed Nov 28 2007, 03:17PM
Zum Beispiel Registered Member #514 Joined: Sun Feb 11 2007, 12:27AM
Location: Somewhere in Pirkanmaa, Finland
Posts: 295
I'm waiting desperately for you to finish this monster! I want to see those big 8kVA sparks tongue

One thing that has been buggin me though: Your secondary looks pretty thin for such high power? I know next to nothing about VTTCs, so are the secondaries usually smaller on VTTCs? Or does it just look small because the base is so huge?

Anyway, good luck on getting the beast running smile
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Dr. Drone
Wed Nov 28 2007, 04:39PM
Dr. Drone Registered Member #290 Joined: Mon Mar 06 2006, 08:24PM
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Posts: 1673
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Dr. Drone
Fri Jul 18 2008, 11:13PM
Dr. Drone Registered Member #290 Joined: Mon Mar 06 2006, 08:24PM
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Marko
Fri Jul 18 2008, 11:25PM
Marko Registered Member #89 Joined: Thu Feb 09 2006, 02:40PM
Location: Zadar, Croatia
Posts: 3145
Hi dr. spark!

Sorry to see your problems with oil tank - that must be frustrating!

Watching at this coil for some time - why did you decide to go with *crappiest* transformers in production -MOT's, while $ is less of a problem to you and I would think a coil of that size would deserve a dedicated filament transformer - small pole pig, or PT? I know you have at least 1 pig around?

Still after all this cool work I guess you want to fix the mot tank.


I'm jealous of all your cool glass tubes, I've just realized what a pain in the ass it is to house and cool ceramic tubes.

Marko
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Dr. Drone
Fri Jul 18 2008, 11:41PM
Dr. Drone Registered Member #290 Joined: Mon Mar 06 2006, 08:24PM
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Marko
Fri Jul 18 2008, 11:58PM
Marko Registered Member #89 Joined: Thu Feb 09 2006, 02:40PM
Location: Zadar, Croatia
Posts: 3145
Oh- how you mean ''the coil was not happy''? Tubes overheating, shorter sparks? Did you use level shifter with it as well?

In any case I don't understand why would it be worse too high, too low voltage?


For 230V mot's meh - there are plenty in Europe and they don't really look like quality, ah paper insulation!

Marko
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Dr. Drone
Sat Jul 19 2008, 12:10AM
Dr. Drone Registered Member #290 Joined: Mon Mar 06 2006, 08:24PM
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Marko
Sat Jul 19 2008, 12:33AM
Marko Registered Member #89 Joined: Thu Feb 09 2006, 02:40PM
Location: Zadar, Croatia
Posts: 3145
Chris, have you checked this thread?

Link2

The guy from denmark has 12 equal MOT's, all 230V ofcourse.

But in any case, unless you are using a single MOT, what's wrong with simply seriesing primaries of two 120V MOTs?

Regarding the frequency, it's really irrelevant difference between 50 and 60Hz. And 50Hz MOT will only work better on 60Hz in any case...


Still you really think it's worth to ship MOT's across Atlantic? I 'd never even think about that, too much weight!

But MOT's aren't plentiful in Croatia either, I only have a single one here, no organized salvage or anything.

Just curious, where are you going to get your 200A supply? If I needed 8kW, wouldn't an easier first step be to use 3phase supply?
Is it crucial for you to have single-phase halfwave rectified input, for this coil?
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