My 811a Vacuum Tube Tesla Coil

This is a video of my dual 811a power triode Vacuum Tube Tesla Coil based on Steve Ward's VTTC1 design.  The secondary is a 3 inch PVC pipe wound with 850 turns of 24 awg magnet wire.  The primary coil is 20 turns, with a 1000pf tank capacitor.  Currently I am achieving 6-7" sparks, with minimal tuning and adjusting.

i couldn't make mine so i bought this
<p>hey, is it hot...? :/ i heard somethings about heating this kinda stuffs...!</p>
I got it for my bir-day
You know, if you put some aluminum foil on it, you can draw some arcs!<br><br>Just be very careful!
Please can you post how you made this I love it it's amazing I love the fluorescent light
Yay! im not the only kid who has made tesla coil
sure not im nine
i know it is weird but its true
That's awesome! I was 11 when I built my first coil and 13 when I got this one running.
yeah i just seem to like electronics and im in primary school and they all think im a nerd but i dont care BTW thanks for the reply.
If other kids call you a nerd, don't get mad at them because it just means that they are admitting you are smarter than them. I personally know that it is hard being called a nerd or a geek especially by the &quot;cool kids&quot; but when I stopped and thought about it, they knew I was smarter than them and they were jealous so they had to find a way to make fun of me for it. Your coil looks pretty cool. I have some suggestions for you:<br> <ul> <li> Make a primary coil with a bunch of turns so that you can tune the coil. &nbsp;Connect one wire with a clip lead. Starting at one and a half turns (where you have it now), incrementally (1/4 or 1/8&nbsp;of a turn each time)&nbsp;move the clip lead along the wire and try the coil. &nbsp;You want to look for improved output. If it gets worse as you go out, go back to the original spot and move inward. <li> Smooth out the spark gap electrodes. &nbsp;The corona will deplete the charge and cause it to fire before the capacitor is fully charged. <li> PUT A 10M OHM RESISTOR ACROSS THE CAPACITOR!!! This is to bleed the charge after you turn the coil off;&nbsp;without it, somebody could be in for a real&nbsp;surprise. </ul>
yeah thanks for the advice those electrodes are gonna have a dremel to them.
Cool! Let me know your results!
man the results are awsome u can make a arc like a metre long and its cool <br>beacause they arc to my finger with no pain.
WOW! That's amazing! You are using a 15kv Neon Sign Transformer, right? I ask because my wimpy little sgtc throws 20cm arcs but I'm only using a 6kv transformer.<br><br>A word of advice about touching the arcs is while it may be painless, there is a very good chance that you may get rf burns from it so be careful!
yeah i was always careful about RF burns and im not sure why it makes so <br>big arcs maybe just good luck.
im 11 and im making mine now so awesome knowing you started then for u but now for me!!!!!!!!!!
Cool! Have fun and good luck!
I have made a instructable on my tesla coil be sure to take a look i would appriceate that so much. thanks christian
Nice job! <br>Did you use the primary resonant type circuit?<br>
Yes and no, I used a feedback coil to switch the tubes based on the secondary coil's resonance frequency, but I do have a tuned LC circuit as part of the primary as well.
Nerd! Lol just kidding! That's really cool.
Most excellent
Awesome! the classic light bulb trick! awesome.
What's crazy is that I can light up the bulb from about 4 feet away when there is no breakout rod on the topload!!! Handheld lights!!!
very cool

About This Instructable


23 favorites


Bio: I like to make things that move, sense, calculate, compute, blink, and make noise. I like making things that create high voltages, electrical arcs, and ... More »
More by Teslaling: The Valve Caster 2.0: Tube Boost and Overdrive Build Your Own 555 Timer Helios 3: Homemade Rocket Candy Powered Rocket
Add instructable to: