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4hv.org :: Forums :: Tesla Coils
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4Kva Dual GMI-7 VTTC - FIRST SPARKS

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Dr. H.
Fri Jul 04 2008, 06:53PM
Dr. H. Registered Member #931 Joined: Mon Jul 30 2007, 05:25PM
Location: Bulgaria
Posts: 486
** UPDATE** - another (hmmm triple posting ...)

Hi guys - I've promissed I will fire it today and I did smile And here the sooooooo long waited pics. The ceiling is exactly 96sm from the breakout point ( vertical). The coil is maintaining almost continuous spark with the ceiling at full power (NO STACCATO). The coil is not tuned at all - so I hope to make bigger spark - hmmm but first have to move out of the shop ... I will upload some videos but later (my cammera is rubbish so I will take from a friend )
1215197565 931 FT33582 Pic 5183

1215197565 931 FT33582 Pic 5184

1215197565 931 FT33582 Pic 5185
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Steve Ward
Fri Jul 04 2008, 07:18PM
Steve Ward Registered Member #146 Joined: Sun Feb 12 2006, 04:21AM
Location: Austin Tx
Posts: 1055
Thats excellent!

Do you have any measurement of the power consumption? It would certainly seem to be much more than 4kVA to produce those sparks, unless there is a big hole in my understanding of spark formation for various types of tesla coils. Id estimate the power is more like 8kVA to get those sparks at 50pps.
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vasil
Fri Jul 04 2008, 08:13PM
vasil Registered Member #229 Joined: Tue Feb 21 2006, 07:33PM
Location: Romania
Posts: 506
Wonderful!!
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Mates
Fri Jul 04 2008, 11:09PM
Mates Registered Member #1025 Joined: Sun Sept 23 2007, 07:53PM
Location: Czech Rep.
Posts: 566
Great!!!! amazed Looking forward the video - I'd love to hear it too...
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Arcstarter
Fri Jul 04 2008, 11:26PM
Arcstarter Registered Member #1225 Joined: Sat Jan 12 2008, 01:24AM
Location: Beaumont, Texas, USA
Posts: 2253
WOW! Nice vttc! I really want some tubes like that now ;). I need a valve with 20kv on the plate!
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Alexandre
Sat Jul 05 2008, 02:05AM
Alexandre Registered Member #1228 Joined: Tue Jan 15 2008, 01:08AM
Location: Curitiba, Brazil
Posts: 162
GOOD GOOD GOOD GOOD

Very Wonderful VTTC :P
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Dr. H.
Sat Jul 05 2008, 04:20AM
Dr. H. Registered Member #931 Joined: Mon Jul 30 2007, 05:25PM
Location: Bulgaria
Posts: 486
Hi guys
thanks for the positive reply smile
Steve - I am not quite shure about the power but every MOT has 10A fuse on it and they are holding up - soo in the worst case it is about 5kVA.
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Steve Conner
Sat Jul 05 2008, 12:51PM
Steve Conner Registered Member #30 Joined: Fri Feb 03 2006, 10:52AM
Location: Glasgow, Scotland
Posts: 6706
Yay, congrats \o/

Nice to see someone using a different tube too, 833s get boring after a while smile
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Dr. Drone
Sat Jul 05 2008, 04:58PM
Dr. Drone Registered Member #290 Joined: Mon Mar 06 2006, 08:24PM
Location:
Posts: 1673
shades
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vasil
Sat Jan 02 2010, 11:09PM
vasil Registered Member #229 Joined: Tue Feb 21 2006, 07:33PM
Location: Romania
Posts: 506
What are the characteristics of a GMI-7 tube? What is the power dissipation on anode and grid 1 and 2?
What you mean 4.4 K bleeding resistor? Is the grid 1 leak resistor?

I am trying to make an idea about these modulator tubes before acting stupid.
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