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-   -   Replacements for polyethylene capacitors? (http://www.diyaudio.com/forums/parts/168566-replacements-polyethylene-capacitors.html)

Rod Beauvex 14th June 2010 01:46 AM

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?

SY 14th June 2010 02:06 AM

I seriously doubt the capacitors are actually polyethylene- it's FAR too thermally wimpy for that service. They were probably polyester (polyethylene terephthalate).

Salas 14th June 2010 02:10 AM

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.

Rod Beauvex 14th June 2010 02:23 AM

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.

Salas 14th June 2010 02:44 AM

Mylar is a Dupont trademark for polyester film. Just polyethylene are the shopping plastic bags.

SY 14th June 2010 03:09 AM

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.:D:

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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