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Registered Member #4104
Joined: Fri Sept 23 2011, 06:54PM
Location: Uk .
Posts: 122
Hi
My new best VTTC i have made :D
Specs are -
Primary 30 turns feedback 15 turns grid resistor 3.3Kohm grid capacitor 1.4 nF tank capacitor 740 pF Supply MOT Full wave rectified + 1uF smoothing capacitor . secondary topload is base from a small coke can .
Secondary is 9cm total Hight , 5cm diamiter and has around 6cm worth of windings with 0.125mm wire and then coverd in insulation tape as it all i have on hand . Output arc is just above 4" long ( 10 - 11cm Long ) on a previouse secondary that was abit taller i got 13cm arcs . Anode heating is there but not that bad . probably could do with more tuning .
But i love the bushy output from full wave supply :D and as this is my second coil im really happy with results .
Registered Member #4104
Joined: Fri Sept 23 2011, 06:54PM
Location: Uk .
Posts: 122
Patric wrote ...
Beautiful result! Is the 811a not turning red?
Thanks :) , anode will turn a light red after 15 seconds using this secondary befor i remade secondary it would run cooler probaly need abit of tuning again , at full power main isseue is secondary heating , under halfwave operation it wasnt not that bad . but CW it gets hot fast .
Power input is 4.5 amps @ 230 V so just over 1Kw In .
Registered Member #2899
Joined: Wed Jun 02 2010, 06:31PM
Location: Deinze, Belgium
Posts: 255
This is my coil. The regulation works really perfect, the output of the MOT can be regulated between 1750V (tube light red) and 1000 V (tube can work for hours).
Registered Member #4104
Joined: Fri Sept 23 2011, 06:54PM
Location: Uk .
Posts: 122
Nice :) , I just use my variac to addjust mine . I plan to maker a wider primary and retune and then interupt coil with a mosfet in cathode - ground connection .
Registered Member #4104
Joined: Fri Sept 23 2011, 06:54PM
Location: Uk .
Posts: 122
PhilGood wrote ...
Very nice coil !
I just built one with specs close to yours, but running halfwave, and I also have problems with secondary and tube heating at full power ...
Hi ,
Nice Coil There :) , I have changed mine back to halfwave as running full wave i was getting arc overs from primary to secondary .
I now pulse the coil on and off via a mosfet in cathode - ground connection and i have no anode redding and secondary only gets warm :) and it still pushes 4" Arcs :D
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Mini Full Wave MOT VTTC 811a Coil
