Re: Are these TDK HV Capacitors any good ? ? ?

["Tesla list" <tesla-at-pupman-dot-com>]

Original poster: "Scott Hanson by way of Terry Fritz <teslalist-at-qwest-dot-net>" <huil888-at-surfside-dot-net>

Unfortunately, the TDK UHV series are DC capacitors with a rather high
temperature coefficient (Z5T). They are not for RF use. The dissipation
factor is quite high, at .2%, presumably at 1 kHz.

TDK does make a similar series of HV ceramic capacitors (FD series) that are
rated for AC service, but I couldn't find any specific info on dissipation
factor. Although used in laser triggering applications, the rep rates are
relatively low compared to the RF frequencies used in Tesla coils.

Stick with capacitors using polypropylene dielectric for spark-gap coils and
mica for VTTC's.

Scott
----- Original Message -----
From: "Tesla list" <tesla-at-pupman-dot-com>
To: <tesla-at-pupman-dot-com>
Sent: Monday, February 24, 2003 7:49 PM
Subject: Are these TDK HV Capacitors any good ? ? ?


 > Original poster: "by way of Terry Fritz <teslalist-at-qwest-dot-net>"
<dhmccauley-at-spacecatlighting-dot-com>
 >
 > Just curious if these TDK capacitors are any good for VTTC and other types
 > of tesla coils.
 > I tried looking for a datasheet, but couldn't find one
 >
 > TDK, Type UHV-11A, 50kV, 1000pF
 >
 > If they are, there is a lot of 18 NEW ones going on sale at Ebay below
 > starting at $95.00 and only one day left.  Be a great deal if they were
good
 > caps!
 >
 >
http://cgi.ebay-dot-com/ws/eBayISAPI.dll?ViewItem&item=2510763356&ssPageName=MER
 > C01
 >
 >
 > The Captain
 >
 >