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Old 20th July 2012, 01:36 PM   #1641
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Quote:
Originally Posted by Wellerman View Post
If everything fails I can still order the boards.
Or stick the boards in die-cast aluminum boxes.
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Old 20th July 2012, 09:09 PM   #1642
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I've ordered the same Hifi 2000 enclosures that nAR uses (for both the Pearl 2 and the power supply). They look beautiful.
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Old 23rd July 2012, 08:52 PM   #1643
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Hello,

It's been a while since i've been to the board and Im back and wanting to build a Pearl II phono. I just don't know where to start. Last time I left it at the power supply look up. Since there wasn't a simple configuration I wasn't able to get past that part.

Any help welcomed.
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Old 1st August 2012, 05:02 AM   #1644
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Have anyone built this all in one box, internal layout similar to the Pass Labs XP-15 phono? I prefer a 1 box solution.
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Old 1st August 2012, 02:41 PM   #1645
6L6 is offline 6L6  United States
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It is possible, but you must have some internal shield or can for the transformer.

If I place my RIAA chassis on top of the PSU chassis, it will hum. Once there is about 12-18 inches between the 2 chassis, it's silent.

Perhaps you might want to get a very small box for the transformer, and put the rest in the big box?
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Old 1st August 2012, 02:47 PM   #1646
Tea-Bag is offline Tea-Bag  United States
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I would go with a two box solution, maybe put the tranny and diodes in it, and connect it with the PowerCon connectors.
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Old 1st August 2012, 04:59 PM   #1647
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Quote:
Originally Posted by 6L6 View Post
It is possible, but you must have some internal shield or can for the transformer.

If I place my RIAA chassis on top of the PSU chassis, it will hum. Once there is about 12-18 inches between the 2 chassis, it's silent.

Perhaps you might want to get a very small box for the transformer, and put the rest in the big box?
Quote:
Originally Posted by Tea-Bag View Post
I would go with a two box solution, maybe put the tranny and diodes in it, and connect it with the PowerCon connectors.
I really second those 2 ideas. Whilst running former in another housing may seem troublesome, extra work, extra umbilical and connectors, but I can say by experience it's really worth it. Nothing worse than having extra hum whilst using a low cart output, that you chose for delicateness' of sound !!!!

Best,

nAr
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Old 2nd August 2012, 05:20 AM   #1648
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Thanks guys. I know its a significant benefit to have a separate PSU since this is a DIY project building from scratch, whereas people have to accept the commercial 1 box version as built. Seeing a picture of the internals of XP15 tells me its alright to copy the same layout, morover the tranny doesn't look shielded. I intend to shield it. Afterall countless pre amps manufactured are 1 box. I've planned to have a pair of Cinemag SUT at the input. Its also intended for MC mode only. Thats why I'm still looking to reduce the gain to 40db maximum.
I'm going to give it a try to mount the PSU the same way as XP15 and see if any issues crop up. If I can get away from 2 box, I'll be a happy camper.

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Last edited by coolmaster; 2nd August 2012 at 05:28 AM.
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Old 2nd August 2012, 10:47 PM   #1649
AVWERK is offline AVWERK  United States
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Or you could try a 3 box solution.


Regards
David.

Last edited by AVWERK; 2nd August 2012 at 10:59 PM.
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Old 2nd August 2012, 11:00 PM   #1650
wayne is offline wayne  United States
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A single box may work depending on the transformer. The XP15 transformer is shielded and actually is now double shielded and uses a low noise design. I tried an off the shelf unit and noise was 20 dB higher. They are also rotated for best noise on the original Ono they we're at 90 degrees.
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