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I tried replacing the caps I mentioned below (NAD C275BEE cap C111) with a pair of mismatched Nichicon KG and KW caps. It did restore the midrange and it now has better overall balance.
Since I have to get a "matched" set anyway - what electrolytics are good for audio path use. Value needed is 10uf/50v
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Airtime,
Check this out: Black Gate Caps from Parts Connexion
BLKGATE-60227
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10uF / 250VDC, Std Series 10mmD x 25mmL, Each
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~D
Wherever you go there you are.
There is really no match for Black Gate FK
You might consider the Obbligato Premium Cap (compact size: 35mm x 20mm) 10uF 250V film capacitor. I find it sounds very good in the signal path for an analog output coupling capacitor application with an enclosure space issue. The presentation is decidedly on the warmer side of neutral vs. full-sized higher voltage audiophile caps, IME. When I bypassed the compact Obbligato Premium Cap with a very compact Vishay Roderstein ERO MKP1839 0.01uF 630V film capacitor, the bypass provides better clarity and subjective speed of the base cap from top to bottom, and a better defined center image, without brittleness or spotlighted treble. YMMVSee link:
Edits: 08/22/15 08/22/15
I'm sure that's a great capacitor, but it takes up about 3X the space of a 10uF/50V electrolytic. Then if you bypass it, that requires more space
How about the Elna Silmic II newer silk fiber equipped electros ?
These are already time proven as not needing bypassing in some applications; if u can believe all the online praise...
ELNA Silmic II would be my choice, if I had to use a polar electrolytic with a voltage rating low enough. (I don't think the ELNAs can be had with rating higher than 100V, but the OP only needs 50V.)
That is what I am planning to use to replace the tantalum capacitors in my Threshold CAS-1 with. The tantalum capacitors still work, but I know they are on a suicide mission.
Dave
Dave, "but I know they are on a suicide mission"
Thats funny Lol, thank you for that.
~D
Wherever you go there you are.
Of course, if a 35mm x 20mm film cap is too large, an electrolytic cap might be the only option. As for the bypass cap, the size of it is so small (13mm x 5mm), if the size of the base cap will fit, there should be room enough for the bypass cap to be tied to it.
Wow! That is indeed tiny. Out of curiosity, I just looked up the dimensions of an ELNA Silmic II electrolytic in 10uF/50V size: 11.5mm X 8mm. Thus only a little larger than the proposed bypass capacitor.
I went through this process with my Beveridge amplifiers, trying to find a film cap that would "fit" on the circuit board and not excite oscillations. A 10uF Dynamicap looked ridiculous, in terms of size; one lead had to around to the back side of the PCB to make contact. In the end, I had to settle for the bipolar Nichicon Muse, but the ELNA with a bypass was great, too. The amp was just a little unstable with that combo, however. The OP may not have a problem with circuit stability, so perhaps the choice is wider.
5mm diameter does seem quite small for a 630V film capacitor. I also plan to use it for a loudspeaker crossover application, since its voltage rating is suitable for use as a loudspeaker crossover bypass cap.
I had to make a similar choice; a 10uF electrolytic is used at a critical juncture in my Beveridge direct-drive amplifiers. Further, if you use a physically large (i.e., film type) capacitor in the Beveridge amp, the body of the cap causes the amplifier to oscillate madly. I found consistently that among polar electrolytics, the ELNA Silmic II is absolutely the best sounding. However, if you can find them, you could also try nonpolar Nichicon "Muse" in that value. Even more hard to find are Black Gate non polar types in that value. I measured the ESR of a polar ELNA Silmic II compared to a nonpolar Nichicon Muse; the latter measures better (10uF/50V value in both cases). So, I installed the Nichicon Muse in my Beveridge amps. Prior to that, I had been using an ELNA Silmic II bypassed by an 0.1uF teflon, thus breaking my own custom of not bypassing a coupling capacitor. Truthfully, the latter combo sounded a tad better, but at the expense of de-stabilizing the amplifier.
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