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Old 3rd November 2009, 11:13 PM   #81
cyxg is offline cyxg  Australia
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hi,peter
i built a VSPS for my MM cartridge, do you have +-12VDC PS kit?
thanks
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Old 3rd November 2009, 11:42 PM   #82
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Yes, the PS used with this phono stage will also work with VSPS and voltage can be simply adjusted with a single resistor.
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File Type: jpg ph13.jpg (195.9 KB, 1316 views)
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Old 5th November 2009, 10:30 PM   #83
toufu is offline toufu  United States
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Ok, suckas, I ordered a Denon 103R just so I can test this thing.
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Old 10th November 2009, 10:20 PM   #84
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I had a chance today to do some careful comparisons with PS and as suggested earlier, I did remove C3/C4 across current source: the sound become noticeably better without those caps (less coloration). I also removed C5/C6 and further improvement was observed. I tried without C9/C10 as well, but circuit actually sounded better with those caps in place. Nichicon FG was preferred here over BG STD, something I suspected already. BG N 10-47uF could be another good choice, although not that much better than FG.

I also did some testing with constant current regulator types. I really liked the old production ON Semi, National was second, then the new production ON Semi while Linear Technology LT317 was the worst; nice sound but too technical, ON Semi was OTOH much more musical.

Attached is updated PS schematic.
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File Type: pdf Shunt Regulator v.2.pdf (91.9 KB, 463 views)
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Last edited by Peter Daniel; 10th November 2009 at 10:31 PM.
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Old 10th November 2009, 10:30 PM   #85
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Quote:
Originally Posted by Peter Daniel View Post
I also did some testing on costant current regulator types. I really liked the old production ON Semi, National was second, then the new production ON Semi while Linear Technology LT317 was the worst; nice sound but too technical, ON Semi was OTOH much more musical.
I know you fooled around with batteries a few years ago, have you tried it with this? It's a big difference on the B1.

Regards,

Chris
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Old 10th November 2009, 10:38 PM   #86
toufu is offline toufu  United States
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I installed my Denon 103R and it sounds great! Now I just need to get rid of humming. I twisted the wires and the humming is noticeablly better. Is there anything else I am missing other than to put the cover on and install a grounding post?
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Old 10th November 2009, 10:52 PM   #87
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Properly grounded and shielded, the circuit is very quiet.

Quote:
Originally Posted by chrismercurio View Post
I know you fooled around with batteries a few years ago, have you tried it with this? It's a big difference on the B1.
Presently, I stay away from batteries. I tried them briefly with Ono and wasn't happy with results at all.
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Old 10th November 2009, 11:06 PM   #88
jleaman is offline jleaman  Belgium
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Quote:
Originally Posted by toufu View Post
I installed my Denon 103R and it sounds great! Now I just need to get rid of humming. I twisted the wires and the humming is noticeablly better. Is there anything else I am missing other than to put the cover on and install a grounding post?
Shielding

I ONCE saw some one wrap a thin small piece of wire around a twisted pair and ground it on one end only to remove hum, it worked very well.

Peter, as always DAM NICE WORK,! have such brilliant ideas and clean and easy flowing boards.

J'
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Old 11th November 2009, 12:07 AM   #89
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I'll have to follow up with some pics at some point as I have mine all nicely boxed up in one of Peter's integrated/amp enclosures. My hum was virtually all but eliminated by grounding my tonearm to AC/Chassis ground. Now it seems I will be playing around by removing some caps, but at this point I have already replaced my Pearl with Ono MC stage, very happy with the sound out of this phonopre. Thanks Peter!
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Old 11th November 2009, 04:36 AM   #90
le´flu is offline le´flu  Germany
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Hi Peter,
i had the same impression with C3/4 and will thest removing
cap 5/6.
How can one differ from old to new style ON Semi?

Greetings Ulf
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