Rodenstock Optical Lens Blocks in High-End CD Transports

raydm6

raydm6

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I was surprised to find out recently that Rodenstock manufactured lens glass for high-end CD transports. You may have one in your house.

I believe some of these transports were also used in Marantz, Revox and other players.

I own and still use a 1980's vintage Philips CD-880 CD player which is made in Belgium and is considered a well regarded player with the CDM-1 MKII transport & TDA1541A S1 DAC chip. The unit is over engineered and heavy - it weighs 22 1/2 lbs.
cd880.png

Rodenstock lens cdmechnism - DutchAudioClassics.nl - Information, specifications, photos and service manuals of Philips & Marantz TDA1541 cd players

DutchAudioClassics.nl - Photos and information of classic Marantz & Philips cd-players
www.dutchaudioclassics.nl www.dutchaudioclassics.nl

Rodenstock​

The pursuit of stable performance led to Philips' development of the single-beam swing arm system. Imposing a couterweight (balancing weight) on the side facing the optical lens block enables the system to adjust the weight distribution and move the optical system usigin relatively minimal power. It also facilitated increased structural precision and, perhaps even more importantly, allowed overall movement to be controlled using highly versatile analog servo circuitry.
CDs are irradiated with a 780nm red laser beam from the polycarbonate resin substrate side, and whether the digital data is "0" or "1" is determined by an increase or decrease in the reflection of the laser beam. Thus, extremely accurate optical technology (lens design, lens fabrication, special coatings, and precise assembly) is required for the small optical pickup block.
The company placed in charge of this was the respected German optical manufacturer Rodenstock. Philips has used extravagant glass-backed optical lens blocks designed by Rodenstock in all of their high-grade drive mechanisms beginning with the Philips CDM0.
Click to expand...
www.hifi-advice.com

The almost complete Philips CDM range of CD Mechanisms

Overview of all the Philips CD Mechanisms with links to detailed info pages.
www.hifi-advice.com www.hifi-advice.com
www.hifi-advice.com

Philips CDM Mechanisms – Page 1 – CDM-0, CDM-1, CDM-2, CDM-3

Philips CDM Mechanisms - Page 1 - Detailed information about the CDM-0, CDM-1, CDM-2, CDM-3 Swing Arm Mechanisms.
www.hifi-advice.com www.hifi-advice.com

Philips CDM on thevintageknob.org

vintage Philips CDM CD drives : CDM-1, CDM0, CDM1 Mk2, CDM-3, CDM-4, CDM-4M, CDM-4MD
www.thevintageknob.org www.thevintageknob.org

The evolution of the Philips CD mechanism - DutchAudioClassics.nl

DutchAudioClassics.nl - Photos and information of classic Marantz & Philips cd-players
www.dutchaudioclassics.nl www.dutchaudioclassics.nl
 
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Thanks for the info! I‘m a big fan of Marantz Cd players and will check, what mechanism mine has (I know that it’s a Philips).
 
Rodenstock Optical was the first to use modern day computers for lens design. Beginning around 1975 (can't remember exactly) they used MODCOMP IV computers running the new 16 bit MAX IV operating system. These were developed and manufactured by Modular Computer Systems in Ft. Lauderdale, Florida. Back in those days, these minicomputers were 2 meters tall, had 16K of core memory, costs about $100,000 and were less powerful than today's smart phones.
 
The Philips CDM-0 and 1 sure do have Rodenstock optics. Those were the units which were long life, and had such durable transport mechanisms. The USA official launch was at Miller's department store in Knoxville, TN, then the headquarters for Magnavox then owned by Philips. I attended this.
 
I was trained to service CD players in the 1980s. While Japanese brands like Sony typically used two parallel rods for the optical assembly to ride on, and the assembly was driven from only one side, this caused issues with “shimmy” once the rods got dirty and the fine film of lubricant dried out, causing dropouts and tracking problems.

Philips had a different design. Their optical assemblies pivoted from one common stepper motor, in a circular arc, to read the tracks from center to edge of the disc. This design was intrinsically better because it didn’t have the tracking problems of the parallel rod design.
 
JoeV said:
I was trained to service CD players in the 1980s. While Japanese brands like Sony typically used two parallel rods for the optical assembly to ride on, and the assembly was driven from only one side, this caused issues with “shimmy” once the rods got dirty and the fine film of lubricant dried out, causing dropouts and tracking problems.

Philips had a different design. Their optical assemblies pivoted from one common stepper motor, in a circular arc, to read the tracks from center to edge of the disc. This design was intrinsically better because it didn’t have the tracking problems of the parallel rod design.
Click to expand...
I agree. The Philips CDM Swing Arm transport was the superior approach and tracked the discs better. I also preferred the sound quality of those players, their DAC was sonically superior. .
 
I’ve got a working Marantz CD75 II player. Does it have Rodenstock lenses? I know that it sounds great 👍
 
santino said:
I’ve got a working Marantz CD75 II player. Does it have Rodenstock lenses? I know that it sounds great 👍
Click to expand...
It appears you do (CDM-1 Mk II) and the TDA1541A – SAA7220P/B DAC Chip-set according to several web site specs:

www.hifi-advice.com

Marantz CD player DAC chipset and transport list

The most complete Marantz DAC/Transport Mechanism overview available, courtesy of Vasiltech.
www.hifi-advice.com www.hifi-advice.com

Marantz CD 75II

Blog High-Fidelity Stereo. Vintage Audio and Hi-Fi Equipment, info, specifications, descriptions,
stereonomono.blogspot.com stereonomono.blogspot.com

www.canuckaudiomart.com

Marantz CD 75 II Special Edition CD Player Philips CDM-1 MK II TDA1541A chip set like Philips CD880

Everything works as it should.It featured one of the best Philips CDM-1 MK II deck , Philips TDA1541A and SAA7220P/B DAC chip set , the same configuration used in the famous Philips CD880.This player is Made in Belgium and is the Limited ``Special Edition" which has the higher quality Audio grade...
www.canuckaudiomart.com www.canuckaudiomart.com
 
I can't believe that after this thread is open for a couple of weeks that no one has tried to adapt the lens assembly to a mirrorless camera!
Now I have to check the basement for my old CD player. Back when they cost real money.

Dating ourselves... My Dual 1249 died. But my Sony BoomBox bought in 1988 is still going.
 
Sonnar Brian said:
I can't believe that after this thread is open for a couple of weeks that no one has tried to adapt the lens assembly to a mirrorless camera!
Now I have to check the basement for my old CD player. Back when they cost real money.

Dating ourselves... My Dual 1249 died. But my Sony BoomBox bought in 1988 is still going.
Click to expand...
Now that's an ingenious idea.

Be interesting to see what it produces:

Philips CDM1 mkII cdmechanism - DutchAudioClassics.nl

DutchAudioClassics.nl - Photos and information of classic Marantz & Philips cd-players
www.dutchaudioclassics.nl www.dutchaudioclassics.nl
Philips-cdm1mk2-005.jpg
 
Sonnar Brian said:
I can't believe that after this thread is open for a couple of weeks that no one has tried to adapt the lens assembly to a mirrorless camera!
Now I have to check the basement for my old CD player. Back when they cost real money.

Dating ourselves... My Dual 1249 died. But my Sony BoomBox bought in 1988 is still going.
Click to expand...
My Dual 1019 is still in very regular use. Still performs superbly! (Dual is 1967 vintage)
 
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