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Digital Source Digital Players and Recorders: CD , SACD , Tape, Memory Card, etc.

Recommend an old CD player with very good transport?
Recommend an old CD player with very good transport?
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Old 18th January 2017, 08:53 PM   #11
Ivo-Cici is offline Ivo-Cici  Macedonia
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Send a message via MSN to Ivo-Cici Recommend an old CD player with very good transport?
For sure CDM 1 mkII mechanism...
Maybe best many bay is Philips CD880???
Ciao
Ivo-Cici
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Old 18th January 2017, 09:21 PM   #12
TNT is online now TNT  Sweden
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Sony 50ES

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Old 19th January 2017, 05:46 PM   #13
Salar is offline Salar  Germany
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Just bought four CDM-1 based Philips from a house cleareance sale.
Really in a bad shape, the seller told me they were stored in a cellar. Thin black dust (I assume coal) and so much moisture that the bottom tin plates did rust to a dark grey. Even the cast aluminium of the CDM-1 has corroded with a rought white layer. First time I did see a black stain on a cotton bud when cleaning a lens.

But testing error correction with Digital Recordings "CD-Check",
one of those four players plays the highest error sizes (4x1.5mm - 6mm total)
without any clicks. None of my other players is able to do that. (but the other three CDM-1 based players fail as well). Because every CDM-1 has to be aligned in the factory (horizontal position, height and vertical angle) the sweet spot might be rarely achieved to allow perfect readout. But this is my assumption. Maybe less of an assumption:
The CDM-1 (and swing arm in general) uses only one horizontal servo. All other designs use two - one for coarse movement (the whole laser) one for the lens (fine movement).
I assume, when an big error (i.e gap in readout) appears, both servos will never be congruent - the laser loses track thus extending the gap. But with the swing arm, the laser
will be "stuck" in position. But as I said it is an assumption.

The four players are two Philips CD-104, one CD-304, one CD-304MKII.
The CD-304-MKII provides digital out, maybe the first Philips player to do so.
But servo design of all 4 players is identical.

They are all built like tanks, even though the design looks mediocre.
I mentioned the tin bottom plates, one could also take the chassis for plastic
but it is dull black painted die cast aluminium. Seek times are very slow btw,
I first thought this was an error. This also gives a remembrance why Philips lost many shares to Sony. With Sony, no tin plates and seek times of one second - to the last track. (Using BU-1 based mechs)
Also the trays age They will become stuck.

But still I would also propose a CDM-1 based player besides one fact:
The laser diode (Sharp LT022MC) is now 33 years old and will not last forever.
This is why i bought four of them, to find out wether the diode can be replaced. If this could be done, a CDM-1 based player would become an ever lasting transport:
Ball bearings, brushless motor, glass lenses. Besides the integrated circuits, everything can be replaced.
All the best,
Salar
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Old 25th January 2017, 11:12 PM   #14
apoopoo999 is offline apoopoo999  United States
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If you want to get creative you can pull the guts from a CDM4 player (I found several on ebay for $50-$100) and make a top loading unit. You can buy the top loading parts from taobao or aliexpress for dirt cheap.

Click the image to open in full size.print screen windows

Click the image to open in full size.photoupload
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Old 26th January 2017, 01:23 AM   #15
Crankenfine is offline Crankenfine  United States
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Recommend an old CD player with very good transport?
Thanks for the suggestion but I think I'm looking for a complete player, not really into building them.
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Old 26th January 2017, 04:38 AM   #16
Salar is offline Salar  Germany
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Hi!
From where exactly did you get the top loading parts and stabilizer?
All the best,
Salar
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Old 26th January 2017, 06:04 AM   #17
apoopoo999 is offline apoopoo999  United States
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????

????
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Old 26th January 2017, 08:34 AM   #18
lcsaszar is offline lcsaszar  Hungary
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Is there any project for contolling the Philips CDM-1 transport by a custom built controller + servo + display, not using the original CD player circuit?
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Old 26th January 2017, 09:48 PM   #19
Salar is offline Salar  Germany
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@icsazar to my knowledge not yet. Would like to develop one, but my
technical abilities are zero.

@apoopoo999
Thanks a lot for the links (in my browser they are displayed as question marks)
but online translation does not work, the text is not displayed.
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Old 29th November 2017, 03:27 AM   #20
BillWojo is offline BillWojo  United States
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apoopoo999, if they would sell those top loader chassis as a kit minus the laser transport at a decent price, it would be a big hit. I would love a cool looking top loader but I don't have the skills to do the electrical end of it. Someone should get a kit together and market them.

BillWojo
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