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Old 16th January 2004, 09:03 PM   #1
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Default What kind of cap is this ?

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
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Old 16th January 2004, 11:30 PM   #2
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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...
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Old 17th January 2004, 12:07 AM   #3
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No, this is not Teflon. (M)KT ?

It does not feel soft, makes harsh sound when touching it, it is not possible to stretch. Mylar ?
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Old 17th January 2004, 12:27 AM   #4
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Hi,

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

Gruesst die,
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Old 17th January 2004, 12:32 AM   #5
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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 ?
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Old 17th January 2004, 12:38 AM   #6
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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?

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Old 17th January 2004, 12:53 AM   #7
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well this guy has some on E-bay
http://cgi.ebay.com/ws/eBayISAPI.dll...&category=4662
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Old 17th January 2004, 12:56 AM   #8
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Hi,

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

Cheers,
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Old 17th January 2004, 02:04 AM   #9
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Default 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
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Old 17th January 2004, 07:51 AM   #10
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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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