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Old 28th November 2012, 12:01 PM   #8651
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Figured I would trim values with smaller hug precision bypass. Mkp1837 is good cap, but I would tend to think RTX would be better.
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Old 28th November 2012, 12:04 PM   #8652
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Quote:
Originally Posted by Salas View Post
Yes, a different fruits typical case.
Its the transfer function each design conveys, we can't bolt something in judiciously over subjective qualities with any good guess.
The whys are for scientists much above our DIYer heads.
It does not show higher harmonics easily it takes much pushing.
It effects dynamics that shift overall impression though.
So there you have it, but no guarantee because I haven't evaluated it yet.
Click the image to open in full size.

Have you evaluate?

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Old 28th November 2012, 12:20 PM   #8653
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Quote:
Originally Posted by buzzforb View Post
RIAA caps

Leaaning towards RTX

I have Mundorf SIlver in Oil for output.
If parts connection is able to match RTX, I would certainly try those. Tinfoils are really good for the riaa caps.

I use RelCap polystyrenes / tin foil that Michael Percy sends me matched.

Off course the MKP 1837 are a good economical choice.
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Old 28th November 2012, 12:25 PM   #8654
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Styrenes are better if you are sure tolerance is 1% that isn't the same matched, matched only guarantees are with same value. MKP1837 are also foil better than metallized,
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Old 28th November 2012, 12:57 PM   #8655
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Hi Merlin

Tolerance gives us an idea of the deviance from spec due to manufacture... that is why we match the caps. If we get two caps exactly the same value (say 15nF) one 20% tolerance and the other 1%, there will be no difference at all.
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Old 28th November 2012, 12:59 PM   #8656
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Sorry Ricardo I don't agree, if the cap is manufacturated with 1% is more accurate than if you match the caps.
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Old 28th November 2012, 01:01 PM   #8657
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Quote:
Originally Posted by merlin el mago View Post
Sorry Ricardo I don't agree, if the cap is manufacturated with 1% is more accurate than if you match the caps.
That is a strange thought.

If both caps measure exactly the same why do you believe one is more acurate than the other ?
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Old 28th November 2012, 01:04 PM   #8658
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Because if the cap is 1% tol. rated can't change the value easily so is more stable, if you only match the cap don't guarantee the stability so the cap can change the value when is working.
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Old 28th November 2012, 01:17 PM   #8659
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Maybe, but if the caps are matched and exhibit exactly the same value (and they are build with the same materials) they should vary its capacitance only due to its Temperature Coefficient.

IMO the tolerance is there only to enable the manufacturers to sell caps according to their spec sheets.

Polystyrenes are very stable and do not drift mutch... the only issue is that when we get a lot of 5% styrenes it is fundamental to match them because the same batch brings us 5% variation of specified value.
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Old 28th November 2012, 01:19 PM   #8660
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Look here: WIMA

"Capacitance Tolerance
Tolerance is the permissible relative deviation of the capacitance from the rated value, expressed in per cent. The tolerance is to be measured at a temperature of +20C and is only valid at the time of delivery.


After a longer period of storage or use, the tolerance can increase; but, according to standard specification, it may never exceed twice the value measured at the time of delivery.

The following delivery tolerances are usual for wound capacitors:

1%; 2.5%; 5%; 10%; 20%.

In the case of electrolytic capacitors for which the largest possible capacitance matters, tolerances of +100/-20% also occur."
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