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Registered Member #480
Joined: Thu Jul 06 2006, 07:08PM
Location: North America
Posts: 644
Matrex -
Unfortunately, these capacitors are NOT suitable for use in a Tesla coil tank circuit.
The dielectric is polyethylene terephthalate (Mylar), which is quite "lossy" at typical Tesla coil frequencies and will usually quickly overheat and fail.
However, you already bought them .... they may be better suited for use in a Marx generator or some other DC application.
Registered Member #480
Joined: Thu Jul 06 2006, 07:08PM
Location: North America
Posts: 644
Matrex -
The problem is that they are just totally unsuitable for use in a high frequency circuit. The dielectric quickly overheats internally, and submerging them in oil just can't conduct the heat away from deep inside the cap.
They are really only suitable for DC or audio-frequency applications.
Registered Member #1225
Joined: Sat Jan 12 2008, 01:24AM
Location: Beaumont, Texas, USA
Posts: 2253
I had a 6kv nst and i used 3 of those capacitors in series and a few strings in parallel(cannot remember how many) and they would last a few minutes with bad performance. I upgraded to another fake capacitor from ebay ( ) and i had much better performance but it failed in about 3-4 minutes.
I now use some REAL capacitors, .68uf 1600 volt from CDE and i get even better performance and they do not heat up at all and i have used them for a run time of maybe 5 minutes and they where the same temperature as before i started the run.
So basically do not get tesla coil capacitors off ebay unless they and CDE or another known brand.
Registered Member #1107
Joined: Thu Nov 08 2007, 10:09PM
Location:
Posts: 792
Here is a list of known good caps for sgtc use I also have used the 942c16p33k .33uf 1600v caps and they work very well. basically any 942c series capacitors will work well.
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Are these capacitors Right for my tesla?
