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RE: [TCML] VTTC-My new tube coil
Roger,
If you are interested, I can send you a handful of 650pf x 18kv ceramic
capacitors for your tube coil. Chris used (I believe the value was in
the neighborhood of 2500pf x 30kv each) 2 sets of 2 in series for a
total of 2500pf at 60kv. A bit overkill on the voltage, but they worked
fine on his twin 833C coil. Refer to:
http://www.drspark.org/images/tubeiew.jpg
I tested 2 banks of 50each in series for a total of 0.018uf x 36kv on my
table top spark gap coil (12kv @ 60ma) for over an hour at full output
with no appreciable drift issues, as they never even got warm.
Efficiency wise they are not good for a spark gap coil as the spark
length was about 1/2 of normal, but they work real well on a VTTC.
They're not as frequency stable as their Mica counterpart...but mica is
big $$$. Refer to these images for setup:
http://www.audiotesla.org/images/Audio%20Tesla%20Pictures/833C%20Project
/RF%20Deck/Table%20Top%20SGTC%20with%20ceramic%20doorknob%20MMC-02.gif
http://www.audiotesla.org/images/Audio%20Tesla%20Pictures/833C%20Project
/RF%20Deck/Ceramic%20Doorknob%20MMC-02.gif
http://www.audiotesla.org/images/Audio%20Tesla%20Pictures/833C%20Project
/RF%20Deck/Ceramic%20Doorknob%20MMC-03.gif
For your project I would recommend 2 parallel stacks of six in series
for about 1950pf @ 36kv. You'll need 12 caps total for this arrangement.
Regards,
Hank
-----Original Message-----
From: tesla-bounces@xxxxxxxxxx [mailto:tesla-bounces@xxxxxxxxxx] On
Behalf Of Roger Smith
Sent: Sunday, April 05, 2009 3:56 AM
To: Tesla Coil Mailing List
Subject: [TCML] VTTC-My new tube coil
All this discussion about vacuum tube Tesla coils has been very timely
for me because I have been building one. It is powered by a single MOT
with a voltage doubler and uses an Amperex YD1150A ceramic tube. The
secondary is 3.5" in diameter and 12" long wound with 28 gauge wire.
I'm getting nice 20 inch sword like sparks and it might do a little
better once I get some more efficient capacitors. Right now I am using
two vine bottle capacitors ( .0018uf ) and after a good bit of running
they get quite warm. It takes a lot of energy to warm up vine bottles
full of salt water. Can anyone recommend a good source for RF
capacitors?
Roger
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