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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!
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?
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 ;)
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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GK71 HFVTTC 30cm Flames
