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In Reply to: RE: DEXA Regulator Opinions? posted by fastcat95 on December 20, 2008 at 09:36:38
Recently Nuuk (on diyaudio) reported very good results with the Paul Hynes high-speed, low noise reg for digital. Besides DEXA, there is Tent and AWL that receive praise also. But I could not find any comparisons amongst these. Let us know how it works out.
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Edits: 11/23/09 11/28/09 11/28/09 03/30/10 03/30/10 03/30/10 03/30/10 03/30/10 03/30/10 03/26/11 03/26/11 03/26/11
Hello.
Finally managed to write down test results with Tentlabs, DEXA and Belleson regulators.For I/V stage Belleson regulators are simply useless. DEXA is much better but do need good caps (used 4x ZA 150uF) on output, otherwise they are so slow you fall a sleep. But with caps they are quite good and musical. Still shunt type is the only way to go if you want The best.
CD module (5V) is very critical to PS quality. Again Belleson did not impress. Even LT1085 is more musical. DEXA UWB is great in this position. Do not use any cap next to it, but a big heat sink.
10v input for CD module is regulated with some standard adjustable regulator. It is originally unregulated and something like 12,3v
Did also 'beading' with Murata(6pcs) stuff on CD servo and changed all electrolytes to ZA:s. Not sure if it did any good, but quite easy to complete. Just be careful with those delicate lines.
All shunt regs and 10v reg have common PS with toroid.
Cooling is improved by louvers on top of a player, just over tubes and regs. And 8cm fan with adjustable speed.
Conclusions:This player do need best quality tubes to reach its true potential. Mullard NOS is best so far and Genalex Gold Lion E88CC/6922 is first decent new production tube i have tried and cost almost nothing.
Njoe fitted with a Super Clock, AD797 and good electrolytes is better than original Upsampler setup.
Dexa discrete Opamp is again much better than AD 797 and very reasonably priced.
But all mods done here and Bursons with 4x 15V shunt regs makes Njoe Tjoeb to a KILLER!
Looks like i cannot easily improve this great player much more. After some final tuning i will check how it competes with really expensive stuff. Funny to see how many thousands they need to lay down to beat mine humble project. Quite a few i believe.
ps. My experience with Belleson is limited and they may sound very good somewhere else.pps. Pity i noticed Paul Hynes first now. http://www.paulhynesdesign.com/page6.html
ppps. Hope this helps you and It would be nice to hear of some other HC DIY modified Njoe's and how you have succeed.
Best,
/VK
Edits: 03/26/11 03/26/11 03/26/11 03/26/11 03/26/11 03/26/11 03/26/11 03/26/11 03/26/11 03/27/11 03/27/11 03/27/11 03/27/11 03/27/11 03/27/11 03/27/11 03/27/11 03/27/11 03/27/11 03/27/11 04/03/11 04/03/11 04/03/11 04/03/11 04/06/11 04/06/11 04/06/11 04/25/11 04/25/11 05/05/11 05/05/11 05/07/11 05/07/11 05/07/11 05/07/11 07/03/11 07/03/11
One last i did is 10v (actually 12,5) supply for CD unit, which originally is unregulated.First did put in one basic adjustable regulator to check if idea is any good and it was.
Sound grows bigger and have better definition.
I ordered one 12v NewClassD UWB regulator cause they readily have that value and i have separate PS
You can order 10v unit and put it in place of old DAC regulator and do secondary wiring accordingly.
This mod is not the first one you should do, but rather all-out++
/V
Edits: 07/10/11 07/10/11 07/10/11 07/10/11
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