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Old 2nd August 2012, 11:20 AM   #6511
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Quote:
Originally Posted by FdW View Post
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Ahh, nothing like a well-dressed cat !

Makes me wonder if anyone ever examined the effect of identical/dissimilar resistor and cap values, with constant RC number.
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Old 2nd August 2012, 11:44 AM   #6512
beetle is offline beetle  Germany
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In my Paradise I matched the two channels to better than 0.1%, using 100pF, 220pF caps (in my case, Wima MKS2) as needed (and of course measuring them all) to combine to the perfect value. Similar for the resistors. This took me around 1hr to get it all sorted, but it really is worth the effort.
What do you use to measure such tight tollerances? Or do you just match the chanels?
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Old 2nd August 2012, 12:08 PM   #6513
FdW is offline FdW  Netherlands
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Perfectly clear... Thank you so much....

Can we modify the resistors values to "hot rod" the shunt so it works at higher ccs current ?
Yes
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Old 2nd August 2012, 12:17 PM   #6514
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Yes
See also my notes in Mpp
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Old 2nd August 2012, 01:34 PM   #6515
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Originally Posted by hesener View Post
It's actually quite impressive what good sound comes from Wima MKS2 caps, with this stage, so if the V-Caps better that, it should be an interesting experiment.... With all the efforts in the input stage and current mirrors and buffer, I think the Paradise will be very transparent to component changes.....


I would think so too.
This is what I am going to do:

When I will get the boards, I will build them up using standard parts (WIMA/ DALE/ PANASONIC FC) measure, listen and cross reference it with other phono I have.
Then I will upgrade with The custom 11n and 32nF Aura T I have in the house.


If the phono will respond the way other piece of equipment responded, I will let you guys know and who is interested can join a group by for the VCAP CuTFT.

Souds like a plan?
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Old 2nd August 2012, 01:56 PM   #6516
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Good idea Stefano.
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Old 2nd August 2012, 02:15 PM   #6517
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Quote:
Originally Posted by hesener View Post
matched the two channels to better than 0.1%
The reason i've been buying RIAA caps (1%) by the 100's and K's over the last +25 years.
John Curl's Blowtorch preamplifier

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Old 2nd August 2012, 06:05 PM   #6518
RCruz is offline RCruz  Switzerland
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Originally Posted by jacco vermeulen View Post
Ahh, nothing like a well-dressed cat !

Makes me wonder if anyone ever examined the effect of identical/dissimilar resistor and cap values, with constant RC number.
There is a difference... It is quite difficult to get a good stable soundstage if you use different resistor, cap values (keeping the same RC number), so I find it very expensive to build a very well matched riaa because I always need to buy 10x times the number of parts needed so I can get almost exact matched parts.

I am experienced in this subject as I have built several passive riaa filters in the past.

I dream about teflons but how much would it cost to have matched pairs with the exact values needed ?
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Old 2nd August 2012, 06:17 PM   #6519
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Teflon cap manufacture will also fit the Gaussian distribution curve, could become a painfull event at 5% spread.
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Old 2nd August 2012, 06:30 PM   #6520
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Originally Posted by jacco vermeulen View Post
Teflon cap manufacture will also fit the Gaussian distribution curve, could become a painfull event at 5% spread.
unless you buy them from Parts Conn or direclty from Audience or V-Cap, then you can only buy 2 and precision will be better than 1% ()in my experience most of the time is below 0.5%)

If you know what you want and you know what you need, there is no need for anybody to buy 100s of parts!
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