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4hv.org :: Forums :: Tesla Coils
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GK71 HFVTTC 30cm Flames

Author Post
RateReducer
Sun May 27 2012, 08:21PM Print View
Registered Member #4603
Joined: Wed Apr 25 2012, 07:33PM
Location: Austria
Posts: 159
Today i was bored. So i rebuild my GK71 tweeter.
New secondary has 14 turns of 2mm enameled wire on a 55mm cardboard pipe. Somewhere between 20 and 30Mhz. The choke has the same dimensions.
I used flat copper for the Anode, the ground connection an the feedback.
Power supply is a MOT with bridge rectifier + some microwave caps.







I am quite satisfied with this result

Greetings
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Thomas W
Sun May 27 2012, 10:16PM
Registered Member #3324
Joined: Sun Oct 17 2010, 06:57PM
Location: UK, Dorset, Broadstone
Posts: 1276
wow, thats awsome, i want one so bad D:
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RateReducer
Mon May 28 2012, 04:15PM
Registered Member #4603
Joined: Wed Apr 25 2012, 07:33PM
Location: Austria
Posts: 159
Thanks, Tom Williamson!
It is not that hard to build one.

Here is a new video getting 30cm flames!
I just increased the topload capacitance and added some chemicals on the breakoutpoint.
The ruler is 30cm in lenght...



I like that tube so much!



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Weston
Mon May 28 2012, 11:27PM
Registered Member #1316
Joined: Thu Feb 14 2008, 03:35AM
Location: Cambridge, MA
Posts: 348
So the choke is wound on the same form as the resonator? Does the coupling between them have any effect?
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Pinkamena
Tue May 29 2012, 12:41AM
Registered Member #4237
Joined: Tue Nov 29 2011, 02:49PM
Location:
Posts: 117
Looks like an expensive and dangerous candle XD
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Mads Barnkob
Tue May 29 2012, 05:02AM
Joined: Tue Mar 18 2008, 06:05PM
Location: Denmark, Odense C
Posts: 1897
Looks good and its a massive output for a tube running with cold plates. I got a good deal of tubes that size, maybe its time for a quick hfvttc as you did :)
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RateReducer
Tue May 29 2012, 10:30AM
Registered Member #4603
Joined: Wed Apr 25 2012, 07:33PM
Location: Austria
Posts: 159
@Weston: Yes. I don´t know, i never tried to vary the distance between the 2 coils. But i think it does not matter.

@Pinkamena: That is true! xD

@Mads Barnkob: Thanks! :) It stays cold for about 30 seconds or so, than it gets slightly dark red.
"maybe its time for a quick hfvttc as you did :)" Try it! It is very simple and fun!

Greetings
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TwirlyWhirly555
Tue May 29 2012, 03:27PM
Registered Member #4104
Joined: Fri Sep 23 2011, 06:54PM
Location: Uk .
Posts: 121
Very Nice ,as its a pentiode are you running both grids togethere ( G1 / G2 ) ?
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RateReducer
Tue May 29 2012, 05:06PM
Registered Member #4603
Joined: Wed Apr 25 2012, 07:33PM
Location: Austria
Posts: 159
Thanks.
Grid 1 is for the feedback.
Grid 2 is on supply +. (11,7k)
Grid 3 is on ground.
I could try to connect G1 and G2...

Greetings
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zrg
Sun Jun 03 2012, 02:49PM
Registered Member #4762
Joined: Sun May 06 2012, 05:59PM
Location: Russia
Posts: 87
Well, that's a really well tuned flame discharge generator, I must say.
Being inspired by OP, remade my old GK-71 tweeter. Parameters are quite similar to OP's: ~30 MHz frequency, MOT with full-bridge rectifier and 2uf capacitance, 11k from + to grid 2, 10k from grid 1 to cathode, three power ceramic doorknob USSR caps (K15Y-1) 15 pf each in series, from secondary end to grid 1, as a capacitive feedback.
Plate becomes red-orange after ~20-30 sec run, probably because of no tuning at all

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Tetris
Sun Jun 03 2012, 03:19PM
Registered Member #4016
Joined: Thu Jul 21 2011, 01:52AM
Location: Gainesville, FL
Posts: 660
Did you put salt on the electrode? Why is the arc orange? heh. first thing that came to mind was: oh wow this is high current. second thing: if you are amish that inherited a lot of money, and wants to sort of become more with the world, you'd make this. looks like a candle, but much more dangerous and made of plasma.

but that is one badass coil! there is no other way to say it!
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RateReducer
Sun Jun 03 2012, 05:53PM
Registered Member #4603
Joined: Wed Apr 25 2012, 07:33PM
Location: Austria
Posts: 159
Thanks, zrg! :)
Nice coil. I would like to have ceramic pipes like you use them... The cardboard pipes i use get deformed because of the heat.

Thanks, HighVoltageChick!
No, i do not use salt. It is potassium sodium tartrate. (Stuff to breed crystals xD)

Greetings


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zilipoper
Mon Jun 04 2012, 11:20PM
Registered Member #4152
Joined: Thu Oct 20 2011, 10:18PM
Location: The Russian Federation
Posts: 106
hell fire
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RateReducer
Tue Jun 05 2012, 03:51PM
Registered Member #4603
Joined: Wed Apr 25 2012, 07:33PM
Location: Austria
Posts: 159
That´s a good comparison!
Even more realistic with sulfur on the breakout point!
Nice bluish flames + smell .
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Marko
Sat Jun 16 2012, 02:18PM
Registered Member #89
Joined: Thu Feb 09 2006, 02:40PM
Location: Zadar, Croatia
Posts: 3145
Wow, that has to be one insane plasma tweeter. Any attempts at audiomodulation yet?


I'm wondering if this tube is just right for such a tweeter because it's rated for such a low frequency (20Mhz), which probably means it has quite significant output capacitance which helps loading the coil.


Also, how long are the flames without any dopings on the breakout point?


Marko
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PhilGood
Sat Jun 16 2012, 05:34PM
Registered Member #3806
Joined: Sat Apr 02 2011, 09:20PM
Location: France
Posts: 259
Really amazing, congrats !

I gotta build one of these

Could you please share schematics ?
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RateReducer
Tue Jun 19 2012, 05:09AM
Registered Member #4603
Joined: Wed Apr 25 2012, 07:33PM
Location: Austria
Posts: 159
@Marko: Thanks. Yes i tried to modulate it with a transformer + amplifier... It worked but not very loud. You can find a video on my YT channel.
I am currently working on another tweeter with audio modulation. The flames are about 20cm max. without dopings.

@PhilGood: Thanks. It is just the basic tweeter circuit. You can find many of the in the net. I already posted the grid configuration.
If you have any questions - message ;)

Greetings
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Thomas W
Tue Jun 19 2012, 06:16AM
Registered Member #3324
Joined: Sun Oct 17 2010, 06:57PM
Location: UK, Dorset, Broadstone
Posts: 1276
ive ordered my first tube :D
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RateReducer
Tue Jun 19 2012, 09:35AM
Registered Member #4603
Joined: Wed Apr 25 2012, 07:33PM
Location: Austria
Posts: 159
GK71?
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Dr. Dark Current
Tue Jun 19 2012, 09:52AM
Registered Member #152
Joined: Sun Feb 12 2006, 03:36PM
Location: Czech Rep.
Posts: 3384
Sorry to jump in, I've done some measurements on the GK 71 in the past and it absolutely needs forced air cooling at full plate dissipation, and the plate is not supposed to get red. So if you want your tube to last, direct some air flow onto it and don't let the plate get red.
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Thomas W
Tue Jun 19 2012, 03:17PM
Registered Member #3324
Joined: Sun Oct 17 2010, 06:57PM
Location: UK, Dorset, Broadstone
Posts: 1276
indeed it is the GK71, this is my first valve project and i have no clue what values i should use for resistors, capacitors and types ect D:
i have heard that valves are rather forgiving so.... c:
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RateReducer
Tue Jun 19 2012, 05:46PM
Registered Member #4603
Joined: Wed Apr 25 2012, 07:33PM
Location: Austria
Posts: 159
Thanks for the info Dr. Dark Current!
My tube does not get red
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