My 811a Vacuum Tube Tesla Coil




About: 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 can light fluorescent bulbs at a distance. I like to d...

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.



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    27 Discussions


    6 years ago on Introduction

    Please can you post how you made this I love it it's amazing I love the fluorescent light

    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 "cool kids" 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:
    • Make a primary coil with a bunch of turns so that you can tune the coil.  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 of a turn each time) move the clip lead along the wire and try the coil.  You want to look for improved output. If it gets worse as you go out, go back to the original spot and move inward.
    • Smooth out the spark gap electrodes.  The corona will deplete the charge and cause it to fire before the capacitor is fully charged.
    • PUT A 10M OHM RESISTOR ACROSS THE CAPACITOR!!! This is to bleed the charge after you turn the coil off; without it, somebody could be in for a real surprise.

    man the results are awsome u can make a arc like a metre long and its cool
    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.

    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!