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Old 31st August 2010, 10:14 AM   #11
AndrewT is offline AndrewT  Scotland
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Hi,
what is an extended foil polystyrene?
How do you recognise it?
How bad is a polystyrene that is not extended foil?

I thought aluminium foil and polystyrene insulator were all that was needed for a good audio cap.

Do they make stacked film polystyrene?
All mine are clearly a long continuous coil.
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Old 31st August 2010, 11:03 AM   #12
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PFE210 caps have both excellent accuracy and near record tan-δ (62ppm for a 100nF), but so very long out of production that only the lucky few have practicable values left.
Downside (to me) is the large size again, as the PFE216.
For large values, my preference goes to box types as the PFE225 for phono and active x-over.

Not all axial polystyrene caps (transparents) are crummy btw, some 63Vdc Siemens and Philips types were fine sounding extended foils, measure swell to.

That the turntable and phono stage business has become a niche market is a rotten shame, for phono nutters such as myself it has the pleasant upside that high accuracy polystyrene caps are up for grabs.
41Hz Audio:Cap 63V Film 215pF Polystyene
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Old 31st August 2010, 07:56 PM   #13
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Here are some of the caps I've picked up via Ebay/local surplus. The two black caps in the lower left hand corner are PSBPC caps froom American Radionics. I suspect they are polystyrene, but I'll have to crack one open to make sure. The black, long leaded cap above them is a STK KP80S polypropylene film/foil. The largish blue cap in the middle is a Roederstein MKP1840 metallized polypropylene. The red cap propped up on the blue one is the Mallory polystyrene box cap I mentioned. The blue cap in the foreground below it is an old Wima FKS series film/foil. I just looked it up, and its polyester film/foil - too bad. The two tiny caps to the right of it are Roederstein KP1830 polypropylene film foil - these are what I'm using in my jfet active crossover.. The cap to the far right is a Rifa PFE210. It's one I'm considering for a tube-based RIAA amp. It's 7.41 nF, which is right near the value I need for the upper break point. I'm thinking of using an STK KP80S 22nF cap for the lower break point.
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Old 31st August 2010, 10:24 PM   #14
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MIAL was Mallory owned ? Didn't know that.

I've got a whole bunch of MIAL CPS3 caps, CPS is the French abbreviation for Condensateur Poly-Styrene.(or Plastique Styrene)
(i'll post a picture of a Precis CPS3 cap tomorrow, a Frenchie too)
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File Type: jpg MIAL-715puF.jpg (144.9 KB, 638 views)
File Type: jpg Mial-PS3.jpg (59.2 KB, 630 views)
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Old 31st August 2010, 10:38 PM   #15
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Maybe it isn't Mallory, after all. Most of the Mallory polystyrenes I've seen are the usual laid-in-lead stuff. This red one may be a Frenchie, too. I'll post some more pictures tomorrow as I drag caps out of hiding.
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Old 31st August 2010, 10:52 PM   #16
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Got the straight scoop after some searching - Mial was a German capacitor company that was acquired by TRW. TRW capacitors were acquired by Shizuki, and are now American Shizuki/ASC. I should drag out some of the various polystyre caps I have and sort out who made what. If you have Mial capacitors, they are pretty old, as apparently the company was acquired by TRW in 1978.
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Old 31st August 2010, 11:01 PM   #17
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Here's the Precis cap, 43200pF polystyrene, looks a bit like a RiFa cap case.
MIAL may have had a factory in France.
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Old 31st August 2010, 11:05 PM   #18
Salas is offline Salas  Greece
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I have found a batch of white Arcotronics R.73 KP film foil 1600V. 47n and 15n. Cheap for losing enough in matching. 5% tolerance, DF <3x10-4. Any good for Riaa? PDF.
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Old 1st September 2010, 01:05 PM   #19
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The maisonette caps likely fit inbetween stacked MKP's, say a B32620, and metal foil ones, i'm only familiar with the lower rated foil-only 73 Italians.
Taste is in the trying.

Back in the old DIY days, without access to multi-k drool tools, a basic taste test was eased up by comparing parts which were furthest apart in construction.
Example is a direct comparison between a Roederstein KP1830 and a double-sided metalised MKP1836 of the same manufacturer.

Question is why bother ?
The fun part of being an old and less hairy fckr nowadays is that most know JS about old production parts, not even traders, example is a Philips (label) KS443 box type cap.
Those are excellent polystyrenes (quite popular in DIY Japan btw), but funny enough harder to obtain here in the g.o.d than the ones described earlier.
TEDSS in South Carolina offers a couple of KS443 values for $0.05 each, for 500 minimum. (hasn't been interesting for me due to the high foreign mail/handling cost)

And there are boutique parts from the telecom industry, the grey one is a cap manufactured by Alcatel.

Let's get totally Naked for an example of a "high end" axial polystyrene :
http://www.komponenten.es.aau.dk/fil...elle/KS429.pdf

(i turn jello when i talk epoxy resin, made all kinds of composite stuff with it, from home construction to a 40ft sail yacht.
My hands-on experience with it ranges from navy vessel sonar domes to commercial airplane parts, from automobile body filler to garage floor epoxy coating. I'm currently working on an all-new pit for the water meter, 5ft deep, will also receive an all-side epoxy coating.
Manufacture date of resin sealed/filled foil caps doesn't bother me. )
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File Type: jpg Phily KS 443.jpg (52.6 KB, 197 views)
File Type: jpg Alcatel RD.jpg (8.3 KB, 160 views)
File Type: jpg The Money Pit2.jpg (161.6 KB, 158 views)
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Last edited by jacco vermeulen; 1st September 2010 at 01:09 PM.
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Old 1st October 2010, 03:38 PM   #20
CeeVee is offline CeeVee  Portugal
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Jacco,

What about the russian K71-7s polystyrenes...how good are they ?
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