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From: Phil Allison on 19 May 2010 23:17

"Paul Conners"

>>> <http://i50.tinypic.com/14jtc0l.jpg>
>>>
>>> Electrolytic? Tantalum?
>>>
>>> Manufacturer? Data sheet?
>
>> Siemens. At least from the trademark.
>> Possibly 1 UF at 40 VDC
>>
>
> Type?


** Looks very much like some German made " long life " electros I see in
audio equipment made by Quad in the UK in the late 1970s and 1980s. Normal
electros, airtight sealed in a plastic housing.

Funny thing is, they nearly all failed ( high ESR or open) after 10 to 15
years.


..... Phil


From: Paul Conners on 20 May 2010 01:05
> Nice photo.

Thank you Canon! (A620, handheld.)

> Dimensions would have been helpful.

7 mm H, 4 mm W & D.

> My guess(tm) is Tantalum. It's not ceramic as it appears to be
> polarized. It's not metalized film, for the same reason. It's too
> small for electrolytic. That leaves tantalum.

Being molded plastic, does this automatically rule out electrolytic?

> Siemens sold their cazapitor division to EPCOS:

>
<http://www.kemet.com/kemet/web/homepage/kechome.nsf/weben/014FB383A945D093852

> 5751600535A31/$file/F3296_ProductSelection.pdf#page=3>
> and look for "Tantalum Molded Radial" on Page 7.

Resemblance? Color?

The originals are black and beveled at the front corners. None of these are.
Other than physical, not much to go on...

Thanks.

From: Paul Conners on 20 May 2010 01:05
> ** Looks very much like some German made " long life " electros I see in
> audio equipment made by Quad in the UK in the late 1970s and 1980s. Normal
> electros, airtight sealed in a plastic housing.

[Groan...] Just when I was convincing myself that they were poly-somethings.

> Funny thing is, they nearly all failed ( high ESR or open) after 10 to 15
> years.
> .... Phil

Yeah, I suspect the electros on this PCB causing all sorts of problems. Just
hoping that all the "traditional" form-factor caps I'd replaced were all the
bad ones. Now this non-standard fare...

Thanks, Phil.

PC

From: Rafael Deliano on 20 May 2010 01:38
>> Dimensions would have been helpful.
> 7 mm H, 4 mm W & D.

7,3 x 4,2 x 4,7 mm
The Siemens type was "B 45 181"

>> My guess(tm) is Tantalum.

Yes.
There was an odd old rule "3 Ohm / Volt"
for minimal impendance to drive normal
tantals.
These claimed to be "schaltfest",
somewhat better quality.

MfG JRD
From: ian field on 20 May 2010 08:15

"Paul Conners" <pconners98(a)gUSmail.com> wrote in message
news:0001HW.C81A113E001FBDA2B01AD9AF(a)news.eternal-september.org...
>> ** Looks very much like some German made " long life " electros I see in
>> audio equipment made by Quad in the UK in the late 1970s and 1980s.
>> Normal
>> electros, airtight sealed in a plastic housing.
>
> [Groan...] Just when I was convincing myself that they were
> poly-somethings.
>
>> Funny thing is, they nearly all failed ( high ESR or open) after 10 to 15
>> years.
>> .... Phil
>
> Yeah, I suspect the electros on this PCB causing all sorts of problems.
> Just
> hoping that all the "traditional" form-factor caps I'd replaced were all
> the
> bad ones. Now this non-standard fare...
>
> Thanks, Phil.

If you think one/some are faulty, make a note of value/voltage and break one
open - the difference between an alu' foil electro and a tant' should be
easy to see.


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