Hello, In the near future i need some small capacitors about 40 nanofahrad to make a 12 db 600 hertz filter at the input of my amps. There will be only little voltage. So what i need are c's that have good sonics and will keep their value during the next decades. I am afraid Audio Note will be not accurate enough or they must be willing to select them for me. Anyone has a suggestion what to use. For the lower part it will be in parallel and for the Tad 2001 it will be in series. Do i have to use identical types for both of them or not? thanks a lot, ed
Hello SY, Strange to say maybe but i was thinking of Wima as not audio grade. But i think i will try some because maybe the very small value and physical dimensions ( i will choose a 63 volt version ) will reduce the influence on the sonics. Maybe the kind of capacitors that are used in riaa stages will do. i WILL WAIT FOR SOME MORE IDEAS AND REMEMBER THEM ALL. THANKS SO FAR, Ed
Hi,
As do the ERO stacked polyprops...still I find them dated as far as their sound goes.
Maybe something to include into that cap/resistor shoot out, SY?
Maybe you should consider something a little more exotic...I mean it, there are much better caps out there without paying through the nose.
Edouard,
Ask Ger Fust from Fust Electronica to match the cap values you need.
If he isn't too keen, tell him I say hello...he will do it than...
Cheers and happy building,
As do the ERO stacked polyprops...still I find them dated as far as their sound goes.
Maybe something to include into that cap/resistor shoot out, SY?
Maybe you should consider something a little more exotic...I mean it, there are much better caps out there without paying through the nose.
Edouard,
Ask Ger Fust from Fust Electronica to match the cap values you need.
If he isn't too keen, tell him I say hello...he will do it than...
Cheers and happy building,
Hi,
To me they all sound different somehow, some more noticeably so than others.
There's a lot to be said in favour of the stacked films, which I don't consider to be cooking grade, BTW.
Could be the filmquality is not up to par, don't really know.
At the end of the day, those who cheat are only cheating on themselves...
Cheers,
To me they all sound different somehow, some more noticeably so than others.
There's a lot to be said in favour of the stacked films, which I don't consider to be cooking grade, BTW.
Could be the filmquality is not up to par, don't really know.
At the end of the day, those who cheat are only cheating on themselves...
Cheers,
So you need "about 40nF," at low voltage. Fair enough. You have a choice of dielectric and a choice of conductive plate (sputtered metal or foil).
Dielectric faults: Dielectric absorption is an effect whereby although a charged capacitor may be momentarily short-circuited, its voltage climbs back up again. Not a good thing for audio. PTFE, polystyrene and polypropylene are good. Dielectric absorption tends to be related to "d". Some manufacturers actually give figure for dielectric absorption.
Plate faults: Sputtered (usually called "metallised") plates are much thinner, so they have higher ESR (Equivalent Series Resistance). It's difficult to see why high ESR should be a problem for coupling/filter capacitors, but it does seem to make an audible difference.
Traditional axial polystyrene capacitors connect the wire to only one point on the foil. All other constructions connect to every part of the foil, drastically reducing ESR and inductance.
Moral: Read the manufacturer's data very carefully. Every manufacturer has a range from "cost effective" to "suitable for sample and hold."
Edit: Polystyrene is the most stable.
Dielectric faults: Dielectric absorption is an effect whereby although a charged capacitor may be momentarily short-circuited, its voltage climbs back up again. Not a good thing for audio. PTFE, polystyrene and polypropylene are good. Dielectric absorption tends to be related to "d". Some manufacturers actually give figure for dielectric absorption.
Plate faults: Sputtered (usually called "metallised") plates are much thinner, so they have higher ESR (Equivalent Series Resistance). It's difficult to see why high ESR should be a problem for coupling/filter capacitors, but it does seem to make an audible difference.
Traditional axial polystyrene capacitors connect the wire to only one point on the foil. All other constructions connect to every part of the foil, drastically reducing ESR and inductance.
Moral: Read the manufacturer's data very carefully. Every manufacturer has a range from "cost effective" to "suitable for sample and hold."
Edit: Polystyrene is the most stable.
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