caps for RIAA network

GAK · 8th February 2004, 10:53 PM

Hi
What kind of caps are best for RIAA network?
I need caps for tube based circuits.This means that caps must be 400 to 630V.

fdegrove · 8th February 2004, 11:48 PM

Hi,

Usually metallised polystyrenes or silvered micas are used.

Cheers,

JonPike · 9th February 2004, 12:05 AM

Polyproplyne is good too.. probably the the best easily available type, since it seems polystyrene is going extinct.

You want close tolerances, at least 5%, if not 2% or better. If you're a pervert for perfection, try to match left and right channel values to as good as you can with a cap meter. (i.e. buy several and use the close pair) This may improve image reproduction.

Digikey has some 2% polyprop caps, though they may not be up to the tube level voltage rating you're looking for. Probably they do in the 5% range. Mouser is another parts supplier that has tons of parts and probably a few suitable choices.

Happy hunting!

8th February 2004, 10:53 PM	#1
GAK diyAudio Member Join Date: Apr 2001 Location: Greece	caps for RIAA network Hi What kind of caps are best for RIAA network? I need caps for tube based circuits.This means that caps must be 400 to 630V. __________________ let's boom chitty boom

8th February 2004, 11:48 PM	#2
fdegrove diyAudio Senior Member Join Date: Aug 2002 Location: Belgium	Hi, Usually metallised polystyrenes or silvered micas are used. Cheers, __________________ Frank

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9th February 2004, 12:05 AM	#3
JonPike diyAudio Member Join Date: Feb 2004 Location: Irvine	Polyproplyne is good too.. probably the the best easily available type, since it seems polystyrene is going extinct. You want close tolerances, at least 5%, if not 2% or better. If you're a pervert for perfection, try to match left and right channel values to as good as you can with a cap meter. (i.e. buy several and use the close pair) This may improve image reproduction. Digikey has some 2% polyprop caps, though they may not be up to the tube level voltage rating you're looking for. Probably they do in the 5% range. Mouser is another parts supplier that has tons of parts and probably a few suitable choices. Happy hunting!

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