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["Tesla list" <tesla@xxxxxxxxxx>]

Original poster: Ed Phillips <evp@xxxxxxxxxxx>

Gentlemen MMC experts:

   I'm passing along this note from a friend of mine who is building 
some 137 kHz transmitters at a power level of a few hundred watts and 
is looking for the best capacitors to tune the tank circuits.  The 
peak voltage is of the order of 200 volts and the capacitance range 
is of the order of 0.01 to 0.03 ufd.  He has been using some WIMA 
polypropylene capacitors and having life problems and I suggested it 
would be worth checking CDE.  Unfortunately I haven't been following 
the MMC discussion here as I haven't any immediate plans for 
same.  Anyone have any comments on his questions?  The WIMA "flat 
pack" style he's been using is very convenient but not if they keep failing!

Thanks for any help,

Ed

I also checked the CDE caps and found what I think are the best for 
the transmitter;
the CDE 941C series looks like it would work very well. I also looked 
up WIMA at www.wima.com and was
trying to compare the WIMA MKP10 series to the CDE 941C, but I am 
having trouble with the WIMA ESR ratings
on similar capacitors. If you get a second could you tell me what you 
think of the WIMA caps as compared to the 941C's? I like the WIMA 
packaging as it is easy to plug a cap into the screw-down board 
terminals, no cutters or pliers required!-Dave