Re: [TCML] MMC Primary Caps for Sale or to recommend

[DC Cox <resonance@xxxxxxxxxxxx>]

Stephen:

I have these caps in stock.

Dr. Resonance





On Wed, Feb 4, 2009 at 8:06 PM, bartb <bartb@xxxxxxxxxxxxxxxx> wrote:

> Hi Stephen,
>
> Yes, Terry's post is absolutely valid. Terry also posted a list of known
> "good and bad" caps.
> http://www.classictesla.com/hot-streamer/TeslaCoils/MMCInfo/good-bad.txt
>
> The 942C series is the one I would recommend as they are probably the most
> widely used by coilers and have an excellent track record.
>
> Here is an MMC chart which might be of use.
> http://www.classictesla.com/download/mmc_cap_chart.pdf
>
> Because your stacking NST's, the options of course change and the current
> doesn't go past 120mA. But, you can also use a program or someones Excel
> spreadsheet to work out what you need.
> http://www.classictesla.com/java/javammc/javammc.html
>
> Regards,
> Bart
>
> Stephen Hiscock wrote:
>
>> I am looking for recommendations for Primary Caps to use for an MMC style
>> capacitor bank.
>> Does anybody recommend specific brands or does anyone have anything they
>> would like to sell me.
>>
>> I was recommended recently by Bart that I should use 1.3 to 1.5 times the
>> NST resonant value.
>> so I will need 6.366nF x 1.3 = 8.3nF to 9.5nF for each 15kv/30mA
>> transformer I have.
>> and I have 5 (or 6 or 7 if I use the 3 phase circuit at home).
>>
>> Basically I need capacitance in multiples of 9nF @ 15kV RMS up to a total
>> of 54nF so I can disconnect transformers for different power levels.
>> All my transformers are rated the same 15kV @ 30mA
>>
>> Terry fritz posted this on:
>> http://www.pupman.com/listarchives/2000/May/msg00528.html
>> 14 May 2000
>>
>> He tested these caps:
>> "0.047uF  1500V Arcotronics capacitors "RS" from Richie Burnett
>> 2.5 amps RMS  350kHz  2.2 degrees C
>>
>> 0.022uF  1200V Panasonic Q-E??  from Bill Noble
>> 2.0 amps RMS 350kHz  4.8 degrees C
>>
>> 0.056uF  1600V Phillips 376 KP/MMKP HQ from Finn Hammer
>> 3.5 amps RMS  350kHz  1.5 degrees C
>>
>> I also retested my Panasonic with my more refined setup of today
>> 0.056uF  1600V Panasonic ECW-H16563JV
>> 3.5amps RMS  350kHz  3.1 degrees C"
>>
>> and found the following points:
>>
>> "I would say the important MMC cap
>> parameters are as follows:
>>
>> 1.  Polypropylene is the ONLY acceptable dielectric
>> 2.  "Self healing"
>> 3.  1500-2000 VDC rating  The ~630VAC rating is immaterial
>> 4.  High-energy, pulse-discharge, high-dI/dT, high-dV/dT, or good
>> continuous end/lead attach is a must.
>> 5.  0.05 to 0.10uF seems to be the best range of values-all things
>> considered.
>> 6.  WIMA, Phillips 376, and other relatively large potted styles seem to
>> run a bit cooler."
>>
>> The post above was quite old, but are these recommendations still valid
>> for capacitors to use as MMC primary Caps?
>>
>> Thanks
>>
>> Stephen
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>>
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