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Registered Member #4108
Joined: Sun Sept 25 2011, 11:43PM
Location:
Posts: 149
Im about to bid on a new mica capacitor for my vttc, my plate voltage is 2 mots in series so just over 4kv. the mica cap is rated at 6kv, is this enough? the auction ends in a hour please let me know!!!
Registered Member #195
Joined: Fri Feb 17 2006, 08:27PM
Location: Berkeley, ca.
Posts: 1111
in the future try to see how much capacitance you need to achieve resonance for your setup if you need 10000pf then you would need 4 2700pf caps. 6Kv is good for mots I think with protection but 10 is better. I have seen other caps like maxwell pulse caps or mika used. you may find other pulse caps like poly CDE945 caps might work.
Registered Member #1316
Joined: Thu Feb 14 2008, 03:35AM
Location: Cambridge, MA
Posts: 365
Whats the value of tank capacitance needed? Try to find capacitors with a KVAR rating, as that is a sign they will work in reactive circuits like a VTTC.
These Russian doorknob caps are great
They will provide plenty of power handling for almost VTTC you will build and the 15kv rating should be fine for running 2 serises MOTs. I used two of the same caps for my vttc and they ran stone cold.
Registered Member #195
Joined: Fri Feb 17 2006, 08:27PM
Location: Berkeley, ca.
Posts: 1111
Hi Weston I believe those caps will work in rf amps but not so shure for pulse application. I'm thinking somthing like this
or this if you can manage it
or thease
or this
or this
the maxwell cap can take 4 MOTs with 6ft sparks, I've seen pictures some whare and the cornell dubillier caps have to be series paralleled to get to the voltage you want for a MMC. hopefully will help.
Registered Member #1316
Joined: Thu Feb 14 2008, 03:35AM
Location: Cambridge, MA
Posts: 365
The capacitor is for a VTTC, which is almost CW operation. Caps for RF amplifiers will work fine in this application.
Most of the capacitors you are linking to would be overkill in a VTTC. A VTTC has rather modest peak tank current and rather high circulating current. Capacitors for this application must be chosen based on RMS power handling, not peak current handling.
Teravolt, even if he intends to run high peak currents, doorknob capacitors are one of the gold standards for pulse duty and the caps I linked would preform fine. Not to mention that all of the caps you linked too are much higher capacitance than the 1300pf Luces requires for his coil.
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is this enough voltage for a tank cap?
