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Old 23rd May 2012, 09:32 AM   #5911
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Well actually i would prefer a bit more gain so i will try 2 x 100 Ohm.
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Old 23rd May 2012, 04:11 PM   #5912
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I rebuild the input stage of the little Pre-Pre to Frans circuit. It works very well. Hum is really zero and the sound got better too, more musical and warm and less dry and over controled. Noise is not audible at the listening place at high volume so my concern was over carefull. I also designed a fitting shunt feedback RIAA. The ADA4898 can deliver 40mA clean so i am using a PhonoClone circuit with much reduced impedance for lowest noise of the second stage. There is an AC and DC coupled version with servo. This little project on the side got me really exited : We have now a Balanced Super Simple Phono Clone that can be fitted close to the cartridge.
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Old 23rd May 2012, 04:35 PM   #5913
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Sorry, C2 is wrong, it is 29nF.
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Old 23rd May 2012, 04:36 PM   #5914
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There is another mistake, "Servo" over the second Opamp should read "RIAA".
I get lazy.
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Old 23rd May 2012, 08:15 PM   #5915
hesener is offline hesener  Germany
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you could call it "phono-clonika" for all those linn fans out there.... they might want to put it in their LP12's......

;-)
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Old 23rd May 2012, 08:33 PM   #5916
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Excuse me Al,
ain't "Klonika" closer to their syntax? ;-)
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Old 23rd May 2012, 08:47 PM   #5917
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OK, we call it the Klonika.
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Old 23rd May 2012, 08:51 PM   #5918
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hello j,
may i call you up tomorrow on a certain question ?
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Old 23rd May 2012, 09:24 PM   #5919
FdW is offline FdW  Netherlands
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Quote:
Originally Posted by Joachim Gerhard View Post
I rebuild the input stage of the little Pre-Pre to Frans circuit. It works very well. Hum is really zero and the sound got better too, more musical and warm and less dry and over controled. Noise is not audible at the listening place at high volume so my concern was over carefull. I also designed a fitting shunt feedback RIAA. The ADA4898 can deliver 40mA clean so i am using a PhonoClone circuit with much reduced impedance for lowest noise of the second stage. There is an AC and DC coupled version with servo. This little project on the side got me really exited : We have now a Balanced Super Simple Phono Clone that can be fitted close to the cartridge.
Now change that active RIAA to a passive one and you get this Balanced input all DC coupled RIAA preamp (almost)
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Old 23rd May 2012, 09:25 PM   #5920
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No, it has a 14dB dynamic range disadvantage at 20kHz. I really prefer shunt.
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