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Old 18th October 2011, 11:59 PM   #2881
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LM317,337 pre regulator and transformer in external box, Jung-Didden type super regulator in the main box for both channels, RC-filter separate for both channels, shunt regulator, decoupling, in order of appearance. Consequent star earthing. There will be a double mono version with two pre regulators, two super regulators, in 4 boxes but the version presented here has already very good channel separation. I will show measurements of the differential RIAA and channel separation.
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Old 19th October 2011, 07:42 AM   #2882
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Old 19th October 2011, 01:32 PM   #2883
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Here are the measurements. I took the output of the RIAA differential with two probes.
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File Type: jpg Diffential Probes.jpg (70.0 KB, 297 views)
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Old 19th October 2011, 01:34 PM   #2884
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Here is the difference and the sum.
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File Type: jpg Diffential Error.jpg (87.1 KB, 291 views)
File Type: jpg Diffential Sum.jpg (93.4 KB, 291 views)
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Old 19th October 2011, 01:37 PM   #2885
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Here is the crosstalk in light blue. I fed in 15mV in one channel and measured the output of the other channel.. Resolution is 2mV. I can only measure noise.
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File Type: jpg Rauschfrei Crosstalk.jpg (83.2 KB, 285 views)
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Old 19th October 2011, 01:43 PM   #2886
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Here is a better picture how the differential probes are connected.
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File Type: jpg Diffential Probes better.jpg (81.4 KB, 250 views)
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Old 19th October 2011, 01:44 PM   #2887
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Thumbs up Great !

Hi Joachim,

That looks wonderful WOW.

Nice Scope you have there

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Old 19th October 2011, 01:48 PM   #2888
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Thanks. Resolution of the difference plot ( orange ) is 5mV, resolution of the main plots is 1V.
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Old 19th October 2011, 01:50 PM   #2889
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Quote:
Originally Posted by Joachim Gerhard View Post
Here is the difference and the sum.
Looking very good indeed.
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Old 19th October 2011, 02:06 PM   #2890
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I visited a lot of people last week. I set up this Phono Stage in 5 systems and it sound very good under a variety of circumstances. Feedback differential RIAA works if done right. Nobody was complaining about a loss of resolution. Quite the contrary. When i switched to balanced input ( unfortunately i could not demonstrate the balanced output because all 5 systems had unbalanced pre- and power amps ) people where amazed by the gain of openness and expansion of the soundstage. For the ultimate in hum rejection balanced is the way to go. The only disadvantage i can see is 3dB more hiss with the same amount of input devices in an unbalanced stage. In praxis that boils down to less because the impedance of the cartridge adds as a noise source.
The Rauschfrei has a Johnson noise of 10 Ohm. My best unbalanced stages reach 5 Ohm.
My Titan has around 6 Ohm so we end at 16 Ohm against 11 Ohm.
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