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OPA1656: High-Performance CMOS Audio Op Amp
OPA1656: High-Performance CMOS Audio Op Amp
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Old Today, 09:20 PM   #701
JRA is offline JRA  United States
diyAudio Member
Join Date: Nov 2013
Location: Elkton, MD
Originally Posted by MarcelvdG View Post
So if I understand you correctly:

3.4 pF, 1 kohm does not work
6.8 pF, 470 ohm works
15 pF, 220 ohm works

Any perceived and measured differences between 6.8 pF, 470 ohm and 15 pF, 220 ohm were actually differences between left and right of your turntable.

Based on that information, I'd also choose 15 pF, 220 ohm.
Do you think it significantly matters whether the damper is just inside the metal shell on the RCA connector or down on the board // the 47K?
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Old Today, 09:28 PM   #702
MarcelvdG is offline MarcelvdG  Netherlands
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Join Date: Mar 2003
Location: Haarlem, the Netherlands
Probably not.
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Old Today, 09:29 PM   #703
Hans Polak is offline Hans Polak  Netherlands
diyAudio Member
Join Date: Mar 2005
Location: Blaricum
Originally Posted by JRA View Post
Would a Wima 0.1uF MKP10 across C4 show any effect or too small? Or I have 2.2, 3.3 and maybe larger in X7R ceramic. What you say Hans?
My favourite to start with would still be to shorten C4 because this reveals most of all. When nothing spectacular comes out in terms of better behaviour or strange DC jumps, remove the short circuit and leave C4 as it is now.
Therefore the new bottom line is, if they called a halt to these festivities and I had just these choices I'd go with the "Good enough" 220R/15pF combo; use the 1612A or 1656 if they sounded better than the current favorite and well-behaved OPA627. So that's today's blog.
The OPA627 is my all time favourite in this sort of applications, so Iím looking forward to hear your final judgement.

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