polypropylene capacitors

[SirPaulGerman]

Got this for $20, poly-carbonate

 

[SirPaulGerman]

So for audio signal

Polypropylene = poly-carbonate and none-metalized is better than metalized

 

[mchambin]

A capacitor made of 100% dielectric material ? 😵

 

[SyncTronX]

yeah , I hear you , but that article is 17 years old, a lot of things changed since then. A lot of designers are using the nichicon Es in audio path.

Richard Marsh would be proud of you really. He is fan of these.

 

[SyncTronX]

Can you guys recommend a good film cap from Mouser or Digikey

Here are the 2 film caps I am going to replace with something newer
10 MF 100V

I was thinking Cornell Dubilier 940C
nice review here

https://www.humblehomemadehifi.com/Cap.html

Holy smokes those are rel-caps. Those are great caps.
Since you don't want them and will change them for something better,
please PM me and Ill give you my mailing address, to send them for me
to experiment with.

Cheers

 

[SirPaulGerman]

Appears to be Panasonic ECQ-V series metallized polyester film.
Also replace those ceramic disc caps with COG/NPO types.

The Panasonic ECQ series are polypropylene

 

[SirPaulGerman]

Holy smokes those are rel-caps. Those are great caps.
Since you don't want them and will change them for something better,
please PM me and Ill give you my mailing address, to send them for me
to experiment with.

Cheers

I was going to use those rel caps in a Acurus preamp, same company

Can you ID those yellow film caps ?

 

[wrenchone]

A side view might hep somewhat as a top view makes them look more or less like any other oval wrap-and-fill cap in the universe...

 

[SirPaulGerman]

Here
ECI

Are those any good ?

 

[thirdicomplex]

The Panasonic ECQ series are polypropylene

Rayma was correct. ECQ is polyester. ECW is polypropylene.

 

[SirPaulGerman]

You may be right
wrong info
https://www.tedss.com/2020023931

 

[wrenchone]

The side view was so blurry as to be useless. Try with a real digital camera instead of a phone, and set it for closeup mode.

 

[SirPaulGerman]

So Panasonic ECQP is Polypropylene
https://www.digikey.be/htmldatasheets/production/102682/0/0/1/ecqp-u-type.html

 

[Kay Pirinha]

So for audio signal

Polypropylene = poly-carbonate and none-metalized is better than metalized

Why, for heaven's sake, do you think that capacitor manufacturers as well as chemists differ between polypropylene and polycarbonate? Both aren't equal, but very different plastics with very different properties!

Anyway, as far as I'm informed, polycarbonate foils as they were used in capacitors aren't produced any more worldwide. Anyway (2), besides it's lower dielectric constant (which is the real answer to the question in posting #1, btw...), polypropylene is the superior dielectric foil in capacitors.

Best regards!

 

[mchambin]

So for audio signal

Polypropylene = poly-carbonate and none-metalized is better than metalized

Is this right info ? 😳
none-metalized 🤣

 

[Mark Tillotson]

A film capacitor without metal isn't going to work well! Does "none-metalized" actually mean metal foil film cap?

 

[Freedom666]

Whats with condensers in a vacuumed glass tube and air as an isolator.

Heard these are the best above all but only small uF possible

 

[Kay Pirinha]

Both is true. Reasonable use only in RF applications, though.

Best regards!

 

[tombo56]

polypropylene is the superior dielectric foil in capacitors.

According to the attached dielectrics comparison, it is the best.

 

[Mark Tillotson]

Whats with condensers in a vacuumed glass tube and air as an isolator.

Heard these are the best above all but only small uF possible

I think you mean pF. They are for high voltage high power RF (kV and kW), the dielectric is vacuum to prevent arcing, their distortion performance compared to PP is probably unmeasured (and dominated by the glass/ceramic envelope), RF LC circuits are much less demanding of linearity as any harmonics are out of band and filtered out, and -40dB intermodulation distortion is viewed as pretty good!