47 Laboratory PiTracer CD transport Unit with one Power Humpty $28.000

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#5
What an ugly piece of gear.
Looks like somebody had a brainfart and couldn't wait to design it properly.

It's also why the PiTracer costs $25.000 USD -- it's a radical design that prohibits mass production.
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Even if you think that PiTracer is the CD transport that Rube Goldberg would build, it's hard not to respect the originality of its design.
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http://www.soundstage.com/revequip/47lab_pitracer.htm

Originality yes - in asking 25 grand. For a cd reader.
 
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#7
kevinkr said:
Hi Fran,
I suspect underneath it all we would probably find it is not too different than the Shigaclone we know and like so well.. 😀 (Same mechanism and chipset in all likelihood.)
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In view of the price class I would have assumed more, that the
JVC EXU-901A Transport mechanism was inside:
http://www.diyaudio.com/forums/digi...ch-ct-1-ct1-better-than-vam1254-cdpro2lf.html
But obviously it isn't, instead of this the mechanism from JVC Boom-Box RC-EZ31A (Sanyo "SF-P 101N").

In case of CD player clones from 47 Lab I have found some URLs, that I have just found but still not explicit study:
http://www.audiostereo.pl/forum_wpisy.html?temat=36475&p=1#k
http://www.audiostereo.pl/forum_wpisy.html?temat=36475&p=5
(at whole 75 pages)
RC-EZ31 manual
(Service Manual JVC RC-EZ31A - Sanyo "SF-P 101N" mechanism for 47lab clones - really inside by 47lab ??)
CD Transport DIY
Google Nachricht
http://www.diyaudio.com/forums/digi...affordable-cd-transport-shigaclone-story.html
http://www.diyaudio.com/forums/digi...affordable-cd-transport-shigaclone-story.html
µÒÁËÒÇÔ·ÂØ¡ÃÐà»ëÒËÔéÇ JVC RC-EZ31
(at whole more than 400 pages)
Ô*×°JVC RC£*Ez 31 CD¡¢¿¨´ø ¡¢ÊÕÒô×éºÏÊÖÌá»ú_ºãÍþÒôÏìµçÆ÷ÌìµØ_°Ù¶ÈÓа¡
ÔÆÍâÌìÂÛ̳ - ¡ºµç×Ó¹ÜÇ°Ö÷ŴóÆ÷¡» - Ö÷Ìâ:47-labsshigaclone
Google Nachricht

Anywhere in one of this mentioned forums was claim, that the most used SF-P101N mechanism could be much more better than the CD-Pro2 (VAM1254) from daisylaser.
Concerning the laser Unit (optical pickup) type Sanyo "SF-P 101N" this could be realy true. But concerning the cheap brushed motor instead a hall motor this is hard to believe.
I would be shocked, when for PiTracer would be a such an ordinary brushed motor from Mabuchi in use.
 
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#8
about
Untitled
I read follow:

"The spindle motor to rotate the disc is a coreless 9 pole motor. This motor has a small inertia and very efficient which is most suitable for CD transport that has to change the speed from 500 to 200 rotations in about a minute and also has to repeat stop and go in a micro scale.
This motor is directly attached to the baseboard that weighs almost 10kgm. By the way, the platter weighs about 90grm with a CD on, so the ratio of the mass of the rotating part and the baseboard is over 100 times which, I suppose, would be sufficient."
 
#12
tiefbassuebertr said:
about
Untitled
I read follow:

"The spindle motor to rotate the disc is a coreless 9 pole motor. This motor has a small inertia and very efficient which is most suitable for CD transport that has to change the speed from 500 to 200 rotations in about a minute and also has to repeat stop and go in a micro scale.
This motor is directly attached to the baseboard that weighs almost 10kgm. By the way, the platter weighs about 90grm with a CD on, so the ratio of the mass of the rotating part and the baseboard is over 100 times which, I suppose, would be sufficient."
Click to expand...
URL is death.
go to
Untitled
 
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