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In Reply to: RE: C0G ceramic Kemet Gold Max Series 300 ? posted by Tweaker456 on August 03, 2016 at 11:46:44
C0G ceramics (also called NP0) just refers to the temperature coefficients. The C0G types are the best in that regard, being best for use in oscillator or tuned circuits. They are still ceramics, however, and will not be as good for audio signal path applications as a good film type capacitor. If you must use a surface mount cap, you can find film types.
Follow Ups:
I replaced what are likely 220pf tantalums with EVOX PFR PP AL foil and am not happy with them so far. Clearer, smoother of course but there is a thinness in sizzly cymbals , a decrease in warmth in voices and last but not least a worsening of sibilance and it's negative aspects. If I put the tants back in I won't be able to shave in the morning. The possible best choices are copper foil Amtrans and copper foil styrenes, both intolerably expensive. These are pretty small , for a dac, and have 5mm spacing. There are a total of 10 of these types of caps that need to be replaced. What to do now?? Tweaker
Just replaced the 220pf Evox PFR aluminum foil PP with Vishay KP1830 (ERO) tin foil PP in a dac. Much much better. Brightness, glare , thinness in cymbals, slight thinness in my test voice and an increased in the irritation of sibilance all gone or way reduced. These are very natural sounding caps. Many good things have been said about tin foil in general and this is my first listen to a tin foil cap. Very impressed. Hopefully they will get better sounding with break in. A blue Wima foil cap from a long time ago was horribly bright, the Evox's are a bit bright and unnaturally thin sounding and I remember cheap small styrenes as being somewhat bright. This tin foil cap has none of those drawbacks and may be the real deal. In my humble opinion. Your mileage may vary. T
Edits: 08/17/16 08/17/16
or thin sounding cymbals in your post. The only time I heard this much about brightness, hiss, or glare was with a SS setup and horn speakers. With all the tweaks you have done you should have been past those stages a long time ago. I can understand a slight edginess but the brightness stuff should have gone been way back.
With the hiss and brightness you describe in past post, I keep wondering if there is something else going on with your setup that you are trying to fix with the tweaks. With all the tweaks you have done you could have built your own DAC.
I know I have asked this before but don't know if you answered it. What does your digital setup consist of? All I know you have a DAC. What is the transport, cables, power cables, preamp, power amp, speaker cables, and speakers?
If I'm correct, I thought I saw you post that you have either Hubbell or Oyaide R1 outlet/s.
This would go a long ways to help us to help you with your system. You have been at this a long time with this DAC. I just to help identify what may be a trouble spot in your system that we can help you with to improve the SQ of your system or DAC.
These new ERO 1830 caps fix the trouble spot. Only I can tweak my system to how I (or my brain) wants it to sound. It's a MF V-dac I got in trade for a digital cable I made that someone liked enough to trade me his spare dac for. There is not one good cap in this dac so I'm replacing them, pretty much all of them. If I had stopped at these small value caps I would not have achieved the substantial and very important improvement with these new caps. This is what the hobby is about to me anyhow. Listening to things, comparing them and eventually staying with what I like. It's sounding vg now and I'm almost finished with it. T
we think about this part and that part then since only you can tweak your system how you like it. It's true, only you know what you like and don't like. I was just trying to help identify a possible trouble spot (if there was one) outside of the DAC. It's hard to help out when someone that doesn't give all the details about their components/systems.So cool, hope you have fun with your DAC. I'm done.
Edits: 08/17/16
Are you sure the 220pF caps are tants? That seems like a very low value for a tantalum. Caps in that range are usually ceramic or maybe mica. Polystyrene will most likely be the best choice in that range.
Not sure they are tants. Looks like you are correct about them being unlikely to be tants. They are narrow dome shaped and dipped. Very unlike the many obvious ceramic caps that were in this circuit. So maybe polyester? In the distant past I have had the experience of feeling that styrenes were a bit clinical and possibly too bright, stuff like the MIALs'?? They are orange domes marked 220j and nothing else. So I'll give up the idea of C0G and figure something else out. It's the small size that so limits the choice. This is the last series of caps to replace in this dac. Liked the stacked film, loved the Elna Silmic II and now am running into a bit of a snag. Thanks, Tweaker
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