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Re: Tube coil capacitors



Hi Dave,

	The ECWH(V) series on page 324 of the Jan-Mar. catalog look great.  They
were not available when I bought mine (pg. 322 P3521-ND  ECQP(U)).  The
things to watch for are dissipation factor and the word polypropylene.
These are both 0.1% at 1kHz.  The suggested applications of "high voltage,
high frequency, and high pulses" is another clue that they are made to
deliver high currents quickly with low loss.  Just the ticket for our
stuff.  These caps are probably better than the old micas.  One may have to
figure out which cap gives the needed value for the best price, but either
series should work very well.

	Terry
 


At 09:34 AM 2/18/99 -0500, you wrote:
>Terry,
>   Your testimony is encouraging. I really like the idea of combining many
small
>value caps to produce just about any value desired. Let's make sure we're
>talking about  the same thing. These caps are found in Digikey's online
catalog
>at http://info.digikey-dot-com/EC/V3/324.pdf (Don't have their current paper
>catalog) and are called "High voltage Metallized Polypropylene Film
>Capacitors"--ECWH(V). The 1600 Vdc, .0056 uF caps sell for $69.75 for a
hundred.
>
>   Are we on the same page?
>Dave
>
>Tesla List wrote:
>
>> Original Poster: Terry Fritz <twf-at-verinet-dot-com>
>>
>> At 05:10 PM 2/17/99 -0500, you wrote:
>> snip........
>>
>> >   I've considered one option: Digikey has Panasonic polypropylene caps
>> >rated at .0056 uf, 1600 vdc. They're fairly inexpensive, so multiple units
>> >could be purchased and series/parallel combined to produce just about any
>> >value  needed. The ability to vary capacitance is of obvious value.
Also, I
>> >wonder if the use of polyprop units will result in a higher  circuit Q
over
>> >that which would be effected by using Mica caps? snip....
>>
>> Other things have pulled me away from my many caps primary cap project but
>> I wanted to say that those Panasonic poly caps have performed with
>> excellence for me!  They run cold and have very high margin.   I think
>> mixing them together to get a desired value will provide a very good and
>> reliable device!  The 630 volt ones I use break at around 2400 volts.  When
>> I take them apart (I am a failure analysis engineer), their internal
>> construction is very good.  I would not hesitate using them for any TC use.
>>
>>         Terry
>
>
>
>


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