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Dual 811a VTTC, the Kaizer VTTC I

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Mads Barnkob

Sun Sept 07 2008, 07:23PM

Registered Member #1403 Joined: Tue Mar 18 2008, 06:05PM
Location: Denmark, Odense C
Posts: 1968

I tuned the coil using javatc and better performance was achieved. But with great advances comes great disasters.

Conner helped me reveal why my internet constantly stopped working, my coil is operating at 315kHz which is right in the middle of the DSL lines downstream spectrum, which explains that the router lost connection and showed a 2 billion noise db value on the downstream in its firmware homepage :)

Unfortunately I share the apartment with a friend who likes to have internet available at all times, so he dont want me to run it while he is home :(

My PCs lcd panel is also behaving quite strange after the tuning, when it changes from one resolution to another its all just artifacts and flickering and I have to turn on/off the panel to get a picture.

But its not all bad! 16cm sparks!

My dslr didnt take any noticeable damage from a 1Â½ meter range.

More to come when I find some time I am home alone :D

Firefox

Mon Sept 08 2008, 01:38AM

Registered Member #1389 Joined: Thu Mar 13 2008, 12:50AM
Location: Pittsburgh, PA
Posts: 346

Huzzah for an awesome spark maker -and- an interwebs jammer! Take that, you wifi stealers! Very good results!

Anon01

Wed Sept 10 2008, 09:07PM

Registered Member #1589 Joined: Sun Jul 13 2008, 06:40PM
Location:
Posts: 70

I'm selling two 833As. :)

Mads Barnkob

Sat Sept 20 2008, 08:42PM

Registered Member #1403 Joined: Tue Mar 18 2008, 06:05PM
Location: Denmark, Odense C
Posts: 1968

This weekend I had time to work some more with the VTTC.

I did alot of different tests with height and number of windings on the feedback coil, after about 40 different setup I was not happy with the spark length compared to how fast the plates got red. At this point I had the feedback coil at 12 cm above the primary, which was getting way too far up.

Ive been feeding the two tubes 2300V, their ICAS ratings are 1500V each so it was well below to ensure their safety, but as I wanted longer sparks I added a level shifter so I can turn it up around 4400V, but I wont go that far.

Ive been testing some without any structure as opposed to my earlier 40 tests and took a couple of pictures, these are with input voltage somewhere between 3000-3200V.

Here I captured a spark at at least 260 mm length into air, there are no strike rods etc near it or above. Output terminal is at 60cm height.

I would also like to add that the RF current has gone down with the higher voltage, so DSL modem doesn't die that easily anymore, MSN dies quickly but I stay on IRC and bittorrent :)

Firefox

Sat Sept 20 2008, 08:48PM

Registered Member #1389 Joined: Thu Mar 13 2008, 12:50AM
Location: Pittsburgh, PA
Posts: 346

Those sword sparks are awesome, Mads Kaizer. What kind of input power are you using to get the 26cm sparks?

Mads Barnkob

Sun Sept 21 2008, 09:45AM

Registered Member #1403 Joined: Tue Mar 18 2008, 06:05PM
Location: Denmark, Odense C
Posts: 1968

Firefox wrote ...

Those sword sparks are awesome, Mads Kaizer. What kind of input power are you using to get the 26cm sparks?

Combined input power is somewhere around 350 Watts, measured.

I recorded a little video this morning :)

Finn Hammer

Sun Sept 21 2008, 12:11PM

Registered Member #205 Joined: Sat Feb 18 2006, 11:59AM
Location: SkÃ¸rping, Denmark
Posts: 741

Well done Mads,

This is perhaps the only Danish VTTC?

Cheers, Finn Hammer

Alexandre

Sun Sept 21 2008, 02:06PM

Registered Member #1228 Joined: Tue Jan 15 2008, 01:08AM
Location: Curitiba, Brazil
Posts: 162

Niiiccceeee VTTC

Steve Conner

Mon Sept 22 2008, 09:20AM

Registered Member #30 Joined: Fri Feb 03 2006, 10:52AM
Location: Glasgow, Scotland
Posts: 6706

Very nice :)

ICAS stands for Intermittent Commercial and Amateur Service. It's the rating recommended for a radio transmitter that might run for 3 minutes and then switch over to receive for another 3 minutes, and so on.

For Tesla coil work we ignore all that and use the OMGWTF rating

Mads Barnkob

Mon Sept 22 2008, 04:58PM

Registered Member #1403 Joined: Tue Mar 18 2008, 06:05PM
Location: Denmark, Odense C
Posts: 1968

Thanks Finn, Tesla011 and Conner :)

I wont dare to claim that this is the first, but if you haven't heard of others I take that for a good sign!

Your right Conner, ICAS ratings are not our limit, that was just my guideline for adding the level shifter as these tubes wasn't cheap to get from USA to Denmark :o

Id rather go easy and not loose them right away, but as they are running cool now, I will push them harder the next time I get around to experiment.

Input power is now measured to 300 Watts going into the variac set at 160 Volts. Filament is somewhere around 50 Watts. Setting variac at 180 Volts raises power consumption to about 900 Watts but without any significant or even noticeable performance other than a change of sound as the current in the sparks raises.

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Moderator(s): Chris Russell, Noelle, Alex, Tesladownunder, Dave Marshall, Dave Billington, Bjørn, Steve Conner, Wolfram, Kizmo, Mads Barnkob