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4hv.org :: Forums :: Tesla Coils
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Is the GI23B tube good for VTTC?

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grzesiek94
Fri May 14 2010, 11:52AM
grzesiek94 Registered Member #2854 Joined: Wed May 12 2010, 01:18PM
Location:
Posts: 8
Thank you for warning. I have worked with HV so don't be afraid of me :P

My friend wrote about this tube. This tube worked in a military navigation system in impulse technique. 2 tubes were connected in parallel and their average output power (not in impulse) was 40W. Don't seem too much for a VTTC...

I wonder if I shouldn't buy few GU50's and enjoy 3-4 inches sparks...

I know I'm really annoyoing, but I must know everything before I'll start working :P
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Steve Conner
Fri May 14 2010, 12:33PM
Steve Conner Registered Member #30 Joined: Fri Feb 03 2006, 10:52AM
Location: Glasgow, Scotland
Posts: 6706
It's impossible to know everything :P

This tube will perform better and be easier to use than a GU50, that's for sure.

I don't think it's fragile: I've seen pictures of similar tubes cut open, and they have a planar construction with a large button cathode and a grid like a tea strainer.

In response to your other question, a staccato controller can be used with any kind of tube.
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grzesiek94
Fri May 14 2010, 03:28PM
grzesiek94 Registered Member #2854 Joined: Wed May 12 2010, 01:18PM
Location:
Posts: 8
I'll buy this tube. We'll see what it got.

I know that the resistors and caps values can only be found by experimentation, but what values I should try first? I mean grid leak resistor and cap and resonance capacitor.

Huh, I wonder how long sparks I'll get with this tube. :)

Edit:
I can buy also these tubes:
http://frank.pocnet.net/sheets/088/4/4-65A.pdf
http://frank.pocnet.net/sheets/018/g/GMI5.pdf
http://frank.pocnet.net/sheets/018/g/GS9B.pdf
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Mads Barnkob
Fri May 14 2010, 04:38PM
Mads Barnkob Registered Member #1403 Joined: Tue Mar 18 2008, 06:05PM
Location: Denmark, Odense C
Posts: 1968
grzesiek94 wrote ...

I'll buy this tube. We'll see what it got.

I know that the resistors and caps values can only be found by experimentation, but what values I should try first? I mean grid leak resistor and cap and resonance capacitor.

Huh, I wonder how long sparks I'll get with this tube. :)

Edit:
I can buy also these tubes:
http://frank.pocnet.net/sheets/088/4/4-65A.pdf
http://frank.pocnet.net/sheets/018/g/GMI5.pdf
http://frank.pocnet.net/sheets/018/g/GS9B.pdf

I went with a 1nF grid leak capacitor and a resistor network that I could tap at 1K to 2K5 at 500R intervals. Your tank capacitor should be calculated so your primary circuit will resonate at the frequency of your secondary circuit. But you will need to decide this on the basis of a Q value that you decide for your system, I would advice you on reading up on Wards theory section, I used his calculations to build my first.

Math is at the bottom, but read it all: Link2

My VTTC: Link2
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grzesiek94
Sat May 15 2010, 09:54AM
grzesiek94 Registered Member #2854 Joined: Wed May 12 2010, 01:18PM
Location:
Posts: 8
@Mads Barnkob - thank you for info

What about tubes from my previous post?
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Mads Barnkob
Sun May 16 2010, 09:19AM
Mads Barnkob Registered Member #1403 Joined: Tue Mar 18 2008, 06:05PM
Location: Denmark, Odense C
Posts: 1968
grzesiek94 wrote ...

@Mads Barnkob - thank you for info

What about tubes from my previous post?

They are around 50 to 65 Watt anode dissipation, these tubes will only make a small VTTC, in my opinion.
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grzesiek94
Sun May 16 2010, 11:49AM
grzesiek94 Registered Member #2854 Joined: Wed May 12 2010, 01:18PM
Location:
Posts: 8
One more question - does anybody have the staccato controler pcb? I mean only pcb board in file.
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Mads Barnkob
Sun May 16 2010, 12:11PM
Mads Barnkob Registered Member #1403 Joined: Tue Mar 18 2008, 06:05PM
Location: Denmark, Odense C
Posts: 1968
grzesiek94 wrote ...

One more question - does anybody have the staccato controler pcb? I mean only pcb board in file.

I have a layout for a veroboard, the stacatto interrupter you can see at my homepage
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Herr Zapp
Sun May 16 2010, 04:21PM
Herr Zapp Registered Member #480 Joined: Thu Jul 06 2006, 07:08PM
Location: North America
Posts: 644
Mads -

I found the photo of your "breadboard" staccato interrupter, but no schematic. Is this one of the "standard" staccato controller designs, or did you incorporate any special features?

Thanks!
Herr Zapp
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Mads Barnkob
Sun May 16 2010, 09:03PM
Mads Barnkob Registered Member #1403 Joined: Tue Mar 18 2008, 06:05PM
Location: Denmark, Odense C
Posts: 1968
Herr Zapp wrote ...

Mads -

I found the photo of your "breadboard" staccato interrupter, but no schematic. Is this one of the "standard" staccato controller designs, or did you incorporate any special features?

Thanks!
Herr Zapp

I removed the polarity switch and did not use a CT transformer, I added the staccato schematic / veroboard layout to my site :)
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