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Old 6th July 2006, 09:03 AM   #1
mus is offline mus  Canada
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Default 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.
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Old 6th July 2006, 03:29 PM   #2
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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 ...
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Old 6th July 2006, 04:11 PM   #3
rdf is offline rdf  Canada
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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
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Old 6th July 2006, 04:24 PM   #4
EC8010 is offline EC8010  United Kingdom
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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?
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Old 6th July 2006, 05:22 PM   #5
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How about vaseline capacitors ?
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Old 6th July 2006, 08:11 PM   #6
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I've used these caps and found them quite dull. Definitely not high end, and no use for coupling caps.
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Old 6th July 2006, 08:31 PM   #7
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I've used them and they aren't bad, certainly less tizzy and strident than the ubiquitous Solen metallized PP's.
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Old 6th July 2006, 08:41 PM   #8
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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.....
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Old 6th July 2006, 10:24 PM   #9
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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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Old 7th July 2006, 05:12 AM   #10
rdf is offline rdf  Canada
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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?
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