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Old 7th June 2010, 04:04 PM   #3831
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In the meantime my little RIAA pre got an enclosure:

Click the image to open in full size.

Salas fiddled out the best circuit for my choosen V-grade of the 2SK170 (15mA IDSS):

Click the image to open in full size.

I am now really convinced about this phono preamplifier. Compared to my musicserver solution, what is always my reference, I prefer now the phono chain.

It is simply the best phono pre I ever had. Fantastic together with the Denon DL103R.

Soon, I want to build the shunt regulated psu with remote sense. Interesting topic!

Thanks Salas
Franz

/Edit
Here the schematics how I implemented it, including R12/C11 (should I remove C11 with the remote sense psu? Or replace by a lower value foil cap?):

Click the image to open in full size.

Last edited by Franz Gysi; 7th June 2010 at 04:10 PM.
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Old 7th June 2010, 04:16 PM   #3832
Salas is offline Salas  Greece
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You are welcome. Happy listening. They were 15mA range indeed after all. Make your V1.2 shunt reg first, and you will decide about C11 subjectively. I am rather leaning towards you will delete it after listening with and without. If you do delete it, don't put a small film cap there. Just blank. But wait until you listen to it with its reg first. Its another story than now with 317.

P.S. I would like a family picture with TT near. Hey gear, say cheese!
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Old 7th June 2010, 04:33 PM   #3833
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Indeed, it is amazing:

60dB gain with no trannies, only two simple gain stages without global feedback. And a simple line driver. All pure Class-A.

60dB is an impressive amplification factor of one thousand!

No hiss, no hum, no nothing. No opamps,

Just music!

Franz
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Old 7th June 2010, 04:40 PM   #3834
Salas is offline Salas  Greece
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What is your music server comprised of by the way?
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Old 7th June 2010, 04:41 PM   #3835
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Salas

Foto for you:

Click the image to open in full size.

Franz
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Old 7th June 2010, 04:44 PM   #3836
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Quote:
What is your music server comprised of by the way?
As you can see on the foto: a squeezebox, driven by a good quality smps. Attached with spdif the gigaworks DAC (analogue output stage: Lundahl trannies followed by a JC-2).

Yes, the line level is much too high with the JC-2, that could be the reason, that I was unsatisfied with the 60dB of the phono pre in the first try.

Franz

/Edit
Ahh, and all music on a NAS diskserver, WAV or FLAC.
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Old 7th June 2010, 04:47 PM   #3837
Salas is offline Salas  Greece
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Hey thanks for the pic! Real speakers I see also. Good you got it no hiss no hum, because those horns would have shown. What is their sens?
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Old 7th June 2010, 05:01 PM   #3838
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Salas

As you may know: good speakers are always big :-)

Low WAF, but I dont share my apartement with a "W"...

About revealing hum: I have an active 350W professional JBL subwoofer supporting the ACR Live 425 horns.

I think, the sensitivity of my speakers is about 100dB for the horns (Fostex D400/T925). I drive it with a 10W TA2024 t-amp.

This is not true for the four FW250 midrange speakers wich I have to drive with a 100W TK2050 t-amp.

The tube amps are not used any longer, at least not at time.

Click the image to open in full size.

Franz

P.S.
Imho, every speaker with a sensitivity below, lets say 96dB, is wrong. Just look at pro speakers! Only exception: ESL's
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Old 7th June 2010, 05:28 PM   #3839
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Looking forward to test the V1.2 remote sense psu.

Actually, I am euphoric listening to different records.

Vivaldi, four seasons: hey, the violins never had this real true wooden sound before! I can also hear the colophonium striving over the strings.

Then some german 80ies:, Spliff Radio Show: great!

Precise, dynamic, hard. No fatigue!

After this, Johann Strauss, die Fledermaus. A famous recording from Deutsche Grammophon.

Great stage. Big dynamics. Very silent parts. True natural voices!

Franz

Last edited by Franz Gysi; 7th June 2010 at 05:30 PM.
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Old 7th June 2010, 05:52 PM   #3840
RCruz is offline RCruz  Switzerland
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Hi Franz

I see you use a 150r for cart load... is that your final choice for the DL103 ?

BTW..... Nice system...
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