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Bernhard 16th January 2004 09:03 PM

What kind of cap is this ?
 
2 Attachment(s)
Hi,

what brand is this ?
And what dielectric ?

There is glass between leads and case.

I opened a small one, the foil is transparent with a green cast.


Bernhard

li_gangyi 16th January 2004 11:30 PM

it's a probably a teflon cap..some of them are rated mil-spec...I dunno about the ones in urpicture though...should be good for crossover work...

Bernhard 17th January 2004 12:07 AM

No, this is not Teflon. :bawling: (M)KT ? :dead:

It does not feel soft, makes harsh sound when touching it, it is not possible to stretch. Mylar ?

fdegrove 17th January 2004 12:27 AM

Hi,

Quote:

No, this is not Teflon. (M)KT ?
Metallised polyesterfilm.

Gruesst die,;)

Bernhard 17th January 2004 12:32 AM

It is not metallised. It is plastic foil and aluminum foil.

But if this is polyester, why they put that crap :( in the hermetically seald case ? :confused:

fdegrove 17th January 2004 12:38 AM

Hi,

Quote:

But if this is polyester, why they put that crap in the hermetically seald case ?
It is polyester and they used the metal case for environmental protection.

O.K. Film and foil iso metalised than...

Mylar is also a kind of polyester film...I think that's a Dupont De Nemours brandname though...

SY?

Cheers,;)

li_gangyi 17th January 2004 12:53 AM

well this guy has some on E-bay
http://cgi.ebay.com/ws/eBayISAPI.dll...&category=4662

fdegrove 17th January 2004 12:56 AM

Hi,

Quote:

well this guy has some on E-bay
No, NOT the same caps...

Cheers,;)

Apex Jr 17th January 2004 02:04 AM

Cap info
 
I see this might have come from a Tektronix scope
the ceramic boards are very valuable for audio for
guitar amp work. I'm not sure but they look like the
old CP0 spraque oil in paper vitamin Q type but this
is only a guess. You might want to let us know what
scope or Tektronix intrument this picture is from.
Steve @ Apex Jr

Bernhard 17th January 2004 07:51 AM

They were spare parts for I don't know what.

There are also .5075 and .05075 and .005075F.

Maybe they are for some oszillator.

Which means tight tolerance.

Why cheap Polyester ?

I was happy to have some nice coupling caps :(

Also some that look similar are found as coupling caps behind the AC/DC switch of TEK plug-ins.

Isn't it important to have very good quality caps there ?


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