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Registered Member #4104
Joined: Fri Sept 23 2011, 06:54PM
Location: Uk .
Posts: 122
Hi
Thanks you two :) , One thing i have noticed is , even after tube has warmed up for 5 minuits ( long time i know ) , the arcs always start of small and over 30 seconds or so grow to normal size .
Its like as the tank capacitors warm up ; so the arcs get bigger .
Registered Member #4108
Joined: Sun Sept 25 2011, 11:43PM
Location:
Posts: 149
My gu-81m vttc did the same thing. I found it was because it was the wrong type capacitor. The spark length didn't really suffer, but the capacitor heated badly and it soon died
Registered Member #4104
Joined: Fri Sept 23 2011, 06:54PM
Location: Uk .
Posts: 122
Luceš wrote ...
My gu-81m vttc did the same thing. I found it was because it was the wrong type capacitor. The spark length didn't really suffer, but the capacitor heated badly and it soon died
Hmm guess that isn't good then ; I purchased the capacitors from On here and I've herd they are fine for VTTC coils , 780pf each at 30kv but they are fairly physically big considering size . They seem to get warm but don't change temp after the " warm up " at the start . I did Plan on making a larger VTTC using these Capacitors too .... I'll see what happens to the capacitors I guess .
Registered Member #3806
Joined: Sat Apr 02 2011, 09:20PM
Location: France
Posts: 259
Hi again TwirlyWhirly555
I just finished my coil, it works great but I encounter same heating problems as you (secondary and tube)
I just saw you solved your heating problems, but you reduced your coil performance from 4-5" streamers down to 3"...
You may want to have a look at Arcstarter's coil posted here , it is very close to ours ( in fact I tried to reproduce it ) and runs cool at full power...I am trying to understand what makes the difference....
Registered Member #187
Joined: Thu Feb 16 2006, 02:54PM
Location: Central Ohio
Posts: 140
TwirlyWhirly555 wrote ...
Hi
Thanks you two :) , One thing i have noticed is , even after tube has warmed up for 5 minuits ( long time i know ) , the arcs always start of small and over 30 seconds or so grow to normal size .
Its like as the tank capacitors warm up ; so the arcs get bigger .
That happened to me too, and you are correct. As the capacitors heat up, their value changes, bringing your coil into tune.
I made my own tank capacitor using Al foil, 1/8" glass plate and varnish. However, a digital capacitance meter is a must if you go this route.
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My First Mini 811a Tesla Coil
) and runs cool at full power...I am trying to understand what makes the difference....
