Polystrene or bust?

embrown057 · 11th July 2010, 12:17 AM

Fealing being born in the wrong century is what I have become to acquaint to finding a good source of “Polystyrene caps”. On a quest from the great beyond to achieve a sound that one can only seem to find in a particular type or grade of component has been the “Holy Grail” of Audio. I have found sources only to call and hear that they “No longer carry them” or “They were never a big seller”. The Polystyrene caps I can find are not at the tolerance that I need as 1% seems not to be very popular. So this dose not sound like a rant and rage over the quest, the point is “what is the general option on the best substitute for Polystyrene”.

Joachim Gerhard · 11th July 2010, 12:33 AM

LCR in england makes polystyrene caps to 1% tolerance. The best replacement caps i found have a PPS dielectric. They are made by Rifa and Wima. I slightly prefer the SMD parts. A good substitute is Vishey-Röderstein MKP 1837. They come in 1% tolerance and i find the sound neutral. They recently introduced a KP range with film and foil that should be even better in the extreme treble but only very small values are availlable.

jackinnj · 11th July 2010, 03:36 AM

Put "polystyrene" in the Mouser search engine -- if you need values matched to 1% just buy 10 of them. There are several surplus outfits with stock as well.

Conrad Hoffman · 11th July 2010, 03:47 AM

Out of curiosity, what values and voltages are you looking for?

sandyK · 11th July 2010, 04:05 AM

See if Rockby in Australia has what you are after.
SandyK

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embrown057 · 11th July 2010, 07:13 AM

The values I need are 680pf and 1000pf @1% and 63v~200v. I seen the listing your speaking of but do not realy want to order out of the US if I can help it. Mouser has no 1% values and no one is stocking these anymore that I have found at leat not what I'm looking for. I also do not want to order from some one's junk-o-box surplus ebay sale. I will check into the Vishay part numbers that looks good. The seach continues...

embrown057 · 11th July 2010, 07:38 AM

Just checked the Vishay MKP as Joachim recommended but they do not offer the values in that range. The site in Australia dose not have those values either. I ordered five of each, WIMA FKP2 680p & 1000p@100v/2.5% Polypropylene off of Ebay tonight. I just really had my mind set on the Polystyrene caps. I still have not given up yet.

homemodder · 11th July 2010, 08:10 AM

Youre right about the polystyrene caps, they are my preffered caps, I stockpiled them when I saw what was coming, the best ones Ive ever used were the philips 1 percent precision types of the 80s and 90s, they were excellent.

Have a look at this site, I think they have what youre after AMERICAN CAPACITOR CORPORATION - Capacitors proudly made in the United States of America

oncle_tom · 11th July 2010, 09:33 AM

RTX-Polystyrenes from www.thepartsconnexion.com You get there matched pairs.

Peter

jacco vermeulen · 10:53 AM

You probably mean RTE, RTX doesn't come in that range.

(RTX are offered by vendors such as Handmade electronics, no longer by Parts Connexion)

For the 680pF/1% => http://www.hndme.com/productcart/pc/...idCategory=136

11th July 2010, 12:17 AM	#1
embrown057 diyAudio Member Join Date: May 2010 Location: Florida	Polystrene or bust? Fealing being born in the wrong century is what I have become to acquaint to finding a good source of “Polystyrene caps”. On a quest from the great beyond to achieve a sound that one can only seem to find in a particular type or grade of component has been the “Holy Grail” of Audio. I have found sources only to call and hear that they “No longer carry them” or “They were never a big seller”. The Polystyrene caps I can find are not at the tolerance that I need as 1% seems not to be very popular. So this dose not sound like a rant and rage over the quest, the point is “what is the general option on the best substitute for Polystyrene”.

11th July 2010, 03:47 AM	#4
Conrad Hoffman diyAudio Member Join Date: Mar 2007 Location: Canandaigua, NY USA	Out of curiosity, what values and voltages are you looking for? __________________ I used to be an audiophool like you but then I took an arrow to the knee.

11th July 2010, 10:50 AM	#10
jacco vermeulen diyAudio Member Join Date: Oct 2004 Location: At the sea front, just under Rotterdam	You probably mean RTE, RTX doesn't come in that range. (RTX are offered by vendors such as Handmade electronics, no longer by Parts Connexion) For the 680pF/1% => http://www.hndme.com/productcart/pc/...idCategory=136 __________________ Looks like Sponge Bob has killed another thread. Last edited by jacco vermeulen; 11th July 2010 at 10:53 AM.

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11th July 2010, 12:33 AM	#2
Joachim Gerhard diyAudio Member Join Date: Mar 2009	LCR in england makes polystyrene caps to 1% tolerance. The best replacement caps i found have a PPS dielectric. They are made by Rifa and Wima. I slightly prefer the SMD parts. A good substitute is Vishey-Röderstein MKP 1837. They come in 1% tolerance and i find the sound neutral. They recently introduced a KP range with film and foil that should be even better in the extreme treble but only very small values are availlable.

11th July 2010, 03:36 AM	#3
jackinnj diyAudio Member Join Date: Apr 2002 Location: Llanddewi Brefi, NJ	Put "polystyrene" in the Mouser search engine -- if you need values matched to 1% just buy 10 of them. There are several surplus outfits with stock as well.

11th July 2010, 04:05 AM	#5
sandyK diyAudio Member Join Date: Apr 2007 Location: Sydney	See if Rockby in Australia has what you are after. SandyK Search Results Page

11th July 2010, 07:13 AM	#6
embrown057 diyAudio Member Join Date: May 2010 Location: Florida	The values I need are 680pf and 1000pf @1% and 63v~200v. I seen the listing your speaking of but do not realy want to order out of the US if I can help it. Mouser has no 1% values and no one is stocking these anymore that I have found at leat not what I'm looking for. I also do not want to order from some one's junk-o-box surplus ebay sale. I will check into the Vishay part numbers that looks good. The seach continues...

11th July 2010, 07:38 AM	#7
embrown057 diyAudio Member Join Date: May 2010 Location: Florida	Just checked the Vishay MKP as Joachim recommended but they do not offer the values in that range. The site in Australia dose not have those values either. I ordered five of each, WIMA FKP2 680p & 1000p@100v/2.5% Polypropylene off of Ebay tonight. I just really had my mind set on the Polystyrene caps. I still have not given up yet.

11th July 2010, 08:10 AM	#8
homemodder diyAudio Member Join Date: May 2006	Youre right about the polystyrene caps, they are my preffered caps, I stockpiled them when I saw what was coming, the best ones Ive ever used were the philips 1 percent precision types of the 80s and 90s, they were excellent. Have a look at this site, I think they have what youre after AMERICAN CAPACITOR CORPORATION - Capacitors proudly made in the United States of America

11th July 2010, 09:33 AM	#9
oncle_tom diyAudio Member Join Date: Dec 2005 Location: near frankfurt/main	RTX-Polystyrenes from www.thepartsconnexion.com You get there matched pairs. Peter

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