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Old 14th June 2010, 12:46 AM   #1
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Default Replacements for polyethylene capacitors?

I'm in the process of ordering parts to work on a Pioneer SX-82. In addition to Mylars, micas, and stirols, the MPX section has some 'polyethylene' capacitors, which no one seems to sell or make anymore. What would be a suitable replacement type? Ceramics? Polyesters? Some other type?

Also, in the event of an exact value not being available, should I go to the next higher or lower in capacitance?

Last edited by Rod Beauvex; 14th June 2010 at 01:06 AM.
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Old 14th June 2010, 01:06 AM   #2
SY is offline SY  United States
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I seriously doubt the capacitors are actually polyethylene- it's FAR too thermally wimpy for that service. They were probably polyester (polyethylene terephthalate).
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Old 14th June 2010, 01:10 AM   #3
Salas is online now Salas  Greece
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There is a nice one, cheap but biggie, called K75-10 its paper and polyethylene terephthalate, Russian made. Green and big, if it fits, its very high value for money IMHO. You can chase it on Ebay.
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Old 14th June 2010, 01:23 AM   #4
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The service manual refers to them as polyethelyne. Oddly, it refers to Mylars as mMylar, the trade name, (which I was under the impression that Mylar was polyester)

Edit: Misread your post, SY.

Salas, thanks for the tip, but I'm after new production components only.

Last edited by Rod Beauvex; 14th June 2010 at 01:30 AM.
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Old 14th June 2010, 01:44 AM   #5
Salas is online now Salas  Greece
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Mylar is a Dupont trademark for polyester film. Just polyethylene are the shopping plastic bags.
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Old 14th June 2010, 02:09 AM   #6
SY is offline SY  United States
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Quote:
The service manual refers to them as polyethelyne.
The service manual might be mistaken- it's pretty common, since polymers are not part of the EE curriculum.:

Mylar is the trademark for Dupont polyethylene terephthalate (PET). If a cap is made from any other brand, it can't be called Mylar, even if it's chemically the same. So if the caps came from two different manufacturers...
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