Cheap Russian 2.2uF 400V PIO Capacitor

mus · 6th July 2006, 09:03 AM

Hi
Is there anyone had experience with these cheap Russian made 2.2 uF 400 V PIO Capacitors. (About $2 each on eBay)
http://cgi.ebay.ca/2-2-uF-400-V-PIO-...QQcmdZViewItem
I’m just wondering how good they are in sound quality? (For example when using for signal coupling on linestage amplifier). Jensen makes good PIO capacitors too but they are expensive.
Thanks.

Lagroute · 6th July 2006, 03:29 PM

take care these are not PIOs but polyethylene caps !!!
I own K40Y9 ones they are true PIO caps and sound very very good ! but doesn't exist in 2.2uf ...

rdf · 6th July 2006, 04:11 PM

Actually, that might not be such a bad thing. A quick search reveals polyethelene's dielectric constant slots between polypropylene and polystyrene. If like the K40y-9 the leads are probably copper. My inclination would be at $2 a pop to go for it.

http://www.audience-av.com/on_capaci...c_material.htm

http://www.rfcafe.com/references/ele..._strengths.htm

EC8010 · 6th July 2006, 04:24 PM

It's not so much the dielectric constant that's important (otherwise we'd all be using electrolytics), more, I think, the dielectric absorption which tends to be related to tan delta or leakage. In those terms, PTFE and polystyrene are top of the heap, with polypropylene second. Paper? Well, there are so many different types of "paper" that it's a very variable feast.

Edit: I've just cut and pasted the first reference you posted to read it in a decent sized fount. The author says the same thing, which is nice.

A link from your second reference gives the following information for dielectric constants:

COCAINE (68°F) 3.1
COFFEE REFUSE 2.4 - 2.6
COKE 1.1 - 2.2

What sort of person does these measurements, and why?

jacco vermeulen · 6th July 2006, 05:22 PM

How about vaseline capacitors ?

Eusebius · 6th July 2006, 08:11 PM

I've used these caps and found them quite dull. Definitely not high end, and no use for coupling caps.

pedroskova · 6th July 2006, 08:31 PM

I've used them and they aren't bad, certainly less tizzy and strident than the ubiquitous Solen metallized PP's.

KBK · 6th July 2006, 08:41 PM

hhmm..I found a purveyor of 250V 0.47uf and few left of 0.315uf 250V polystyrene caps, and bought every-last-one-of- them. Cleaned him out. I'll never see those again.

I'm waiting anxiously by my mailbox.....

papparazzi · 6th July 2006, 10:24 PM

Hi

I have these caps and I have used them as coupling in my 300b PSU
Certain they have openess and easy on ear no stress but in .my oppinion they colour upped mids,dont sound very dynamic on highs
I found more resolution turning back to my previous Aydyn standard PP caps.
I try next in my speakers crossover Fostex F17 /and Supravox 215s

Papparazzi

rdf · 7th July 2006, 05:12 AM

Quote:

Originally posted by EC8010
It's not so much the dielectric constant that's important (otherwise we'd all be using electrolytics)....

It's my understanding there's a rough correlation between low dielectric factor and cap performance. Polyethylene at 2.26 vs. Polypropylene at 2.2, definite possibilities, especially in the context of $2 caps. The second link surprisingly lists a GHz tangent loss superior to Teflon. I imagine much depends on the oil employed in this particular cap. After reading the sonic adjectives used though I'm keen of giving them a try!
And just 'wow' about the Vaseline.

Quote:

What sort of person does these measurements, and why?

A caffeine addled compulsive?

6th July 2006, 09:03 AM	#1
mus diyAudio Member Join Date: Mar 2006 Location: bc	Cheap Russian 2.2uF 400V PIO Capacitor Hi Is there anyone had experience with these cheap Russian made 2.2 uF 400 V PIO Capacitors. (About $2 each on eBay) http://cgi.ebay.ca/2-2-uF-400-V-PIO-...QQcmdZViewItem I’m just wondering how good they are in sound quality? (For example when using for signal coupling on linestage amplifier). Jensen makes good PIO capacitors too but they are expensive. Thanks.

6th July 2006, 04:11 PM	#3
rdf diyAudio Member Join Date: Jun 2004 Location: big smoke	Actually, that might not be such a bad thing. A quick search reveals polyethelene's dielectric constant slots between polypropylene and polystyrene. If like the K40y-9 the leads are probably copper. My inclination would be at $2 a pop to go for it. http://www.audience-av.com/on_capaci...c_material.htm http://www.rfcafe.com/references/ele..._strengths.htm __________________ Ears aren't microphones.

6th July 2006, 04:24 PM	#4
EC8010 diyAudio Moderator Join Date: Jan 2003 Location: Near London. UK	It's not so much the dielectric constant that's important (otherwise we'd all be using electrolytics), more, I think, the dielectric absorption which tends to be related to tan delta or leakage. In those terms, PTFE and polystyrene are top of the heap, with polypropylene second. Paper? Well, there are so many different types of "paper" that it's a very variable feast. Edit: I've just cut and pasted the first reference you posted to read it in a decent sized fount. The author says the same thing, which is nice. A link from your second reference gives the following information for dielectric constants: COCAINE (68°F) 3.1 COFFEE REFUSE 2.4 - 2.6 COKE 1.1 - 2.2 What sort of person does these measurements, and why? __________________ The loudspeaker: The only commercial Hi-Fi item where a disproportionate part of the budget isn't spent on the box. And the one where it would make a difference...

6th July 2006, 08:41 PM	#8
KBK diyAudio Member Join Date: Dec 2003 Location: The Wilds Of Canada	hhmm..I found a purveyor of 250V 0.47uf and few left of 0.315uf 250V polystyrene caps, and bought every-last-one-of- them. Cleaned him out. I'll never see those again. I'm waiting anxiously by my mailbox..... __________________ "Never forget that only dead fish swim with the stream." -- Malcolm Muggeridge. "Truth cannot be brought down, rather the individual must make the effort to ascend to it." -- Jiddu Krishnamurti

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6th July 2006, 03:29 PM	#2
Lagroute diyAudio Member Join Date: Sep 2004 Location: Paris' suburbs	take care these are not PIOs but polyethylene caps !!! I own K40Y9 ones they are true PIO caps and sound very very good ! but doesn't exist in 2.2uf ...

6th July 2006, 05:22 PM	#5
jacco vermeulen diyAudio Member Join Date: Oct 2004 Location: At the sea front, just under Rotterdam	How about vaseline capacitors ?

6th July 2006, 08:11 PM	#6
Eusebius diyAudio Member Join Date: May 2006	I've used these caps and found them quite dull. Definitely not high end, and no use for coupling caps.

6th July 2006, 08:31 PM	#7
pedroskova RIP Join Date: Dec 2002 Location: C'ville VA, USA	I've used them and they aren't bad, certainly less tizzy and strident than the ubiquitous Solen metallized PP's.

6th July 2006, 10:24 PM	#9
papparazzi diyAudio Member Join Date: Oct 2004	Hi I have these caps and I have used them as coupling in my 300b PSU Certain they have openess and easy on ear no stress but in .my oppinion they colour upped mids,dont sound very dynamic on highs I found more resolution turning back to my previous Aydyn standard PP caps. I try next in my speakers crossover Fostex F17 /and Supravox 215s Papparazzi

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