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Old 12th December 2010, 07:19 AM   #571
nar is offline nar
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Quote:
Originally Posted by dcbingaman View Post
These are REAL BIG and Expensive......but maybe worthwhile. I would guess mounting between the PC boards and the output RCA jacks would work best. Anybody tried this ?
It can be done, in order to do so you can also mount the 100k after the capacitor out of the board too, directly soldered to the RCA leads. The grounding scheme can suffer however, as if you decide rewire (for hum problems) it can lead you to difficult ways. You also need to solder the 100 nF bypass capacitor out of the board too, and place extra jumpers accordingly

nAr
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Old 12th December 2010, 02:40 PM   #572
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Nar, my thoughts, also, however, if you use a good film cap for C13, you probably don't need a bypass cap. The Marsh Multicaps are constructed such that they are actually 10 smaller caps run in parallel to give a lower ESR at high frequencies in a single ( fat) package.

That said, I think I'm going to try a Silmic in one channel and a Black Gate in the other, and see which one I can live with.
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Old 13th December 2010, 06:28 PM   #573
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Will this power supply work?

The σ11 Regulated Power Supply
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Old 14th December 2010, 08:18 AM   #574
nar is offline nar
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Quote:
Originally Posted by budwiser View Post
Will this power supply work?

The σ11 Regulated Power Supply
Nope, you'll need that one :

The σ22 Regulated Power Supply

But please bear in mind that if you build the original Pearl II, the regulators (7824 & 7924) are already on board with a passive Pi filter. You only need to build a symmetric PSU with just diodes bridges and first filtering reservoirs. That's what I did, as per Wayne's pdf. The RIAA is dead silent

Regards,

nAr
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Old 14th December 2010, 08:18 AM   #575
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Quote:
Originally Posted by dcbingaman View Post
Nar, my thoughts, also, however, if you use a good film cap for C13, you probably don't need a bypass cap. The Marsh Multicaps are constructed such that they are actually 10 smaller caps run in parallel to give a lower ESR at high frequencies in a single ( fat) package.

That said, I think I'm going to try a Silmic in one channel and a Black Gate in the other, and see which one I can live with.
Please tell us your listening comments about sonic signature for those capacitors Thanks
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Old 17th December 2010, 11:40 AM   #576
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Here my own detailed parts list.
Attached Files
File Type: zip Pearl-2_Parts List.zip (7.0 KB, 247 views)

Last edited by Algar_emi; 17th December 2010 at 11:42 AM.
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Old 17th December 2010, 11:49 AM   #577
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I did my own PCB, smaller than the standard PassLabs design. It fits on 6''x9'' double side PCB material sheet I used. I got very nice Mundorf M-Lytic power supply caps, Vishay RN-60D resistors all around, and 0.1% CMF-55 resistors at key locations. These are the top and bottom layers, one channel. Both channel fits on 6''x9''
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File Type: jpg Top.jpg (490.8 KB, 796 views)
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Old 17th December 2010, 12:44 PM   #578
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Quote:
Originally Posted by Algar_emi View Post
I did my own PCB, smaller than the standard PassLabs design. It fits on 6''x9'' double side PCB material sheet I used. I got very nice Mundorf M-Lytic power supply caps, Vishay RN-60D resistors all around, and 0.1% CMF-55 resistors at key locations. These are the top and bottom layers, one channel. Both channel fits on 6''x9''

Very nice design
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Old 18th December 2010, 01:36 AM   #579
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Slyvain, check your PL on the size and output of your tranny... An Rcore would beat the philtron at these levels

Regards
David
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Old 18th December 2010, 08:37 PM   #580
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Quote:
Originally Posted by Algar_emi View Post
I did my own PCB, smaller than the standard PassLabs design. It fits on 6''x9'' double side PCB material sheet I used. I got very nice Mundorf M-Lytic power supply caps, Vishay RN-60D resistors all around, and 0.1% CMF-55 resistors at key locations. These are the top and bottom layers, one channel. Both channel fits on 6''x9''
... and you kept the "square landing areas" I added !

I must say, they are nice to live with.
Soldering on top of the board only is easier, also thanks to the "vias"

I perfectly agree for a RCORE transformer, it makes sense for all line levels applications, DACS, preamps, active filters ...

Best,

nAr
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