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Old 30th November 2002, 09:10 AM   #21
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Now for something !!

On the left tinfoil samples, on the right the Solen MKP(polypropylene)

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see below
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Old 30th November 2002, 09:19 AM   #22
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nt
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Old 30th November 2002, 09:23 AM   #23
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on the left the tinfoil from a second manufacturer
-compare on the right another MKT=polyester cap
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Old 30th November 2002, 09:31 AM   #24
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On the left a few good axial polypro caps, on the right five different axial MKT(polyester); two of the MKT are known to me as made in the same factory

Intended was a comparison between good mkp and mkt...
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Old 30th November 2002, 09:32 AM   #25
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On the left a few good axial polypro caps; on the right five different axial MKT(polyester),two of which to me are known as made in the same factory

Intended was a comparison between good mkp and mkt...
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I am glad to contribute something, sorry for the length


Philipp
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Old 30th November 2002, 02:04 PM   #26
Joel is offline Joel  United States
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It just goes to show - people will go to any lengths to "prove" their paper-in-oil caps and carbon comp resistors are better than anything else - including inventing "scientific" tests.

This is the same b.s. as the wire "resonances" people were talking about years ago regarding cloth-covered wire.
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Old 30th November 2002, 02:13 PM   #27
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My latest experiments indicate that not only type of capacitor, but also the polarity (non electrolytics) is important for good sonics.
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Old 30th November 2002, 02:24 PM   #28
dhaen is offline dhaen  Europe
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Philipp,

Thank you for taking the time to post, but please can you tell us:

What are the test conditions?

And,

What are the graph's axis labels?

Thank you,
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Old 30th November 2002, 03:51 PM   #29
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John,

posting is no problem.
Bernd Timmermanns published this data in his magazine Hoby-Hifi (formerly he was chief editor of Klang&Ton. He has a rather high credibility with German hobbyists.

The measurements were done with a very sensitive mechanical pickup placed over the objects,
the scales are from 1-40kHz(horizontal)and 120db(vertical)

The author put emphasis on how technologically advanced the mechanical pickup he used was, and also gave a model number

I will have to look the model number, it only happened this topic arose and I still had the graphs on my harddrive


Philipp
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Old 30th November 2002, 06:53 PM   #30
dhaen is offline dhaen  Europe
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Philipp,

So, it is a graph of external mechanical vibration against frequency.

(Thinks for 5 minutes.....)

Don't worry about the model number.
What I'm trying to get here is if there is any significance to the readings.
The outside of the capacitor is vibrating beacuse the "plates" are being forced together and apart by the electrostatic charge, and that is what we detect...

So, in terms of detected relative amplitude:
The vibration will be greater in amplitude if:
The dielectric is hard. (If soft it will absorb).
or
The winding of the capacitor is loose. (If tight the vibration is tensioned).

In terms of frequency:
We should look for the flattest I think.

But in terms of absolute amplitude, we don't know the applied stress, so can't gauge the significance.

What is the applied current / voltage?
What is the value of the capacitor?
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