Hi diyaudioers, i'm cracking my head trying to NOS a superb Sony CDP337ESD.
First i've tryed lampizator mode with no good, as soon as i feed the BCLK signal to one of the DACS it starts reading bad, and when hooking up the second DAC it just wont read anymore.
After i've tryed another method where i remove CXD1144 but leave all the resistors on the data, BCLK and LRCLK lines, this time kind of worked but really bad.
The only thing that make it behave correctly was to touch with my finger the BCLK resistor and keep it there beign careful to not touch any ground if not the cdp behaves like theres no clock at all (CD spin backwards really fast).
I've tryed a lot, from diffrent values of resistors (and a trimpot) and capacitors in the place of bclk line to making a small transitorized signal amplifier (that went into smoke).
i'm just locked here, any help is appreciated.
Thanks!
First i've tryed lampizator mode with no good, as soon as i feed the BCLK signal to one of the DACS it starts reading bad, and when hooking up the second DAC it just wont read anymore.
After i've tryed another method where i remove CXD1144 but leave all the resistors on the data, BCLK and LRCLK lines, this time kind of worked but really bad.
The only thing that make it behave correctly was to touch with my finger the BCLK resistor and keep it there beign careful to not touch any ground if not the cdp behaves like theres no clock at all (CD spin backwards really fast).
I've tryed a lot, from diffrent values of resistors (and a trimpot) and capacitors in the place of bclk line to making a small transitorized signal amplifier (that went into smoke).
i'm just locked here, any help is appreciated.
Thanks!
Hi PC91,
I also own a Sony 337ESD, you have a great CDP there!
I don't like NOS myself but you might find some clues on this video:
https://www.youtube.com/watch?v=Dtw9Odb7J2A
If you like to share notes on 337ESD maintenance and modifications let me know. I have done lots of work on mine.
I also own a Sony 337ESD, you have a great CDP there!
I don't like NOS myself but you might find some clues on this video:
https://www.youtube.com/watch?v=Dtw9Odb7J2A
If you like to share notes on 337ESD maintenance and modifications let me know. I have done lots of work on mine.
Hi Mike P, I already knew that video, actually is the method i'm using right now with no success, thanks anyway
Take a look at this:
Femto Jitter Clock re Clock Replace CXD1144 in TDA1541A Based CD Players | eBay
Have fun,
Antonio
I've finished modding my own 337ESD (which keeps the oversampling) and the results are stunning, the best CD playback I have ever heard.
The final mods were to add a Tentlabs clock with dedicated PSU, to optimise the decoupling around the filter chip and clock distribution circuit and to implement RC filtering between the filter chip and the DACs.
I love it so much I just bought a second 337 as a spare.
The final mods were to add a Tentlabs clock with dedicated PSU, to optimise the decoupling around the filter chip and clock distribution circuit and to implement RC filtering between the filter chip and the DACs.
I love it so much I just bought a second 337 as a spare.
Dear Mike:
Next week I will start to upgrade my Sony CDP337ESD.
Will you please share with us some pics/ideas about your work?
Thank you in advance,
Antonio
To my 337 i've upgraded the decoupling caps on both TDA1541, added tantalums to the DACS power supply and replaced the clock with an abbas audio tube clock 3.
Sound improved a lot with that, better image, clearer highs, thighter basses
Sound improved a lot with that, better image, clearer highs, thighter basses
Hi, sorry I've been very busy with work recently I forgot about this. I'll start sharing details of the mods I've done to mine.
First up, here's the power supply section. As you can see I've replaced the large electrolytics on the digital power supply with larger capacitance Panasonic FC and FM. On the analogue side I have replaced the rectifier diodes with Schottky diodes. The already excellent big 6800uF Elna caps have stayed but the 1000uF caps after the regulators have been upgraded to Elna Silmic. The 7815 and 7915 regulators themselves have both been upgraded to Fidelity Audio S-power HC regs.
All four of the regs for the +/- 5v suplies to the TDA1541A DAC chips have been upgraded to Fidelity Audio S-powers and the decoupling caps have been upgraded to Elna Silmic.
The 14 bit decoupling caps have around the DACs have been swapped to 220nF boxed radial polyester expect for the MSB's which have 1uF polyester.
The DEM clock oscillator caps have been swapped to 560pF Wima FKP polypropylene film/foil.
I've also upgraded the DAC chips to 1998 manufactured Taiwanese made chips and given them heatsinks.
The resistors downstream of the DACs are Takman metal film with the exception of the IV feedback resistors which are Charcroft naked Z-foil.
The op-amps have been changed to OPA2604 and the output coupling caps are 6uF poly film with the small bypass caps removed. The op-amps power supply decoupling caps have been swapped to Elna Silmic.
The 14 bit decoupling caps have around the DACs have been swapped to 220nF boxed radial polyester expect for the MSB's which have 1uF polyester.
The DEM clock oscillator caps have been swapped to 560pF Wima FKP polypropylene film/foil.
I've also upgraded the DAC chips to 1998 manufactured Taiwanese made chips and given them heatsinks.
The resistors downstream of the DACs are Takman metal film with the exception of the IV feedback resistors which are Charcroft naked Z-foil.
The op-amps have been changed to OPA2604 and the output coupling caps are 6uF poly film with the small bypass caps removed. The op-amps power supply decoupling caps have been swapped to Elna Silmic.
Elsewhere on the PCB all of the electrolytic caps have been replaced with top quality parts such as Rubycon ZLH, Panasonic FM, FC etc. Some have been upgraded to Sanyo Os-con if they're power supply decoupling caps for an IC.
You can see that the potentiometer which controls the PLL frequency has been upgraded to a Bourns sealed multi-turn to allow easier/more accurate adjustment.
You can see that the potentiometer which controls the PLL frequency has been upgraded to a Bourns sealed multi-turn to allow easier/more accurate adjustment.
There are lots of hidden mods under the PCB too. Here you can see extra local decoupling of the DACs -15v rails supplied by the Silmics.
The 15uF oscons tie the -15v rail to the -5v rail of each DAC and the resistors form a small circuit with the DEM oscillator cap to reduce DEM oscillator jitter.
The 15uF oscons tie the -15v rail to the -5v rail of each DAC and the resistors form a small circuit with the DEM oscillator cap to reduce DEM oscillator jitter.
Here are details of improvements to the decoupling on the clock distribution ICs and the filter chip which gets its own oscon directly from the +5v pin to ground. Note the SMD COG ceramics.
Tentlabs clock upgrade on aluminium shelf fitted to existing screw holes (no drilling!). The shelf has a self adhesive bitumen pad under it to reduce vibration.
And the dedicated clock PSU. This is a modified NET Audio clock PSU. Again on an alloy shelf and supported on brass supports which screw into existing holes.
And the dedicated clock PSU. This is a modified NET Audio clock PSU. Again on an alloy shelf and supported on brass supports which screw into existing holes.
This is a great little mod! These COG/NPO caps form an RC filter between the filter chip and the DAC chips. Small parts but they make a big difference.
Besides the modifications I have done a full service of the CD player. The transport has been cleaned and lubricated, the lens has been properly cleaned and all of the laser adjustments have been done (focus bias, focus balance, focus gain and tracking gain). As you saw earlier the PLL frequency has also been adjusted. I have also lubricated all of the motor bearings including the upper and lower bearings for the motor which spins the CD itself.
What a stunning work and what a big amount of money spent!
Congratulations! I supose you´ve got something working and sounding marvelous!
For now I only change some capacitors, nothing relevant...
Later I will try a NOS board, Dexxa SE op-amps, and also Dexxa regulators (less expensive than Fidelity Audio).
When I´ve got it done, I will post some pics and my impressions.
Congratulations! I supose you´ve got something working and sounding marvelous!
For now I only change some capacitors, nothing relevant...
Later I will try a NOS board, Dexxa SE op-amps, and also Dexxa regulators (less expensive than Fidelity Audio).
When I´ve got it done, I will post some pics and my impressions.
Another small upgrade today - resistors R403, 404, 503 and 504 changed to Charcroft 'naked' z-foils.
An externally hosted image should be here but it was not working when we last tested it.
Nice work here. I have a little brother of this 337, cdp-227esd. Can I assume that most of these mods applies to that too? My player is already NOSed, but I looking forward to update at least some capacitors and propably op-amps after dac and clock circuit.
Hi jouniu,
Yes almost all of the mods done to my 337 can be applied to the 227 too. I have also owned two 227ESD's and have the schematic so would be happy to help with specific advice about modding your player.
Personally, I don't like NOS conversions.
Yes almost all of the mods done to my 337 can be applied to the 227 too. I have also owned two 227ESD's and have the schematic so would be happy to help with specific advice about modding your player.
Personally, I don't like NOS conversions.