Carl
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Nagra SF
dcstep
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Good points all, BTW, where'd did the onboard SFs all go???? If you had trouble you pushed a button on my old Bryston 1B. Seems to me if you're going to build a "complete" phono-pre that it'll include a SF. Oh well...

Thanks for the report.

Dave

Carl
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The site of Aalt Jouk van de Hul is well worth reading Dave!

By the way I always wondered why you can not get phono stages with a SF and a simple notch filter. I have got a lot of records in pristine condition but my wife loves old Dutch cabaret. I often find those records but those treasures can use a notch filter.

Somehow high end is not always very practical. I hope for a reaction from Michael.

KBK
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Introducing a filter at the INPUT of a phono pre, where a rumble or Subsonic filter might be placed, is very detrimental to the quality of a tiny phono signal. The SF would have to be at the output end of the phono section.

IMHO, the inclusion of a subsonic filter makes a $2000 phono unit sound like a $500 one.

The short answer is you can have sonic quality... or some desired switches. But not both.

Carl
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I had a Chord phono stage at home for some time. The differences with or without SF were really very small.
I have not compared a phono stage with SF switch and a stage without SF switch. To hear the difference you have to built two near identical stages. I do not think al lot of people had a try but may be Michael or John ???
Personally I do not believe that men (or better you Americans ) can sent a rocket to Mars and are not be able to make a phono stage with a switch you can not hear when it is on "of" position.

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