Modifying the NAD C521BEE

[dcheming]

This project is a work in progress. Some pics of what I've done so far:

Reinforced the disc-clamping bridge with epoxy.




Added dynamat to transport frame, laser assembly, drive motor, main chassis, and top cover.




Added a pair of Mundorf 10uF M-Cap's bypassed with WIMA 0.22uF in each channel for output caps.






Installed an IEC jack and 12ga power wire. The hole came out a bit rough and I scratched the case a few times with the file , but it works.








Eventually I plan on getting a few different op-amps to roll, installing some nicer RCA jacks, replacing all the electrolytic caps with Rubycon ZL series, and changing the S/PDIF out from a RCA to a BNC jack. I don't want to go overboard modding this player since I'm saving the good stuff for a DIY DAC, probably something like the DDDAC1543 MK2.

[dcheming]

I finally got some more terminal blocks so now all of the signal caps going into and out of the opamps can be easily rolled.





I disassembled the Mundorf/WIMA combo and I'm now running an un-bypassed 10uF M-Cap in each position instead.

[clatter]

Looks nice. Well, actually it looks absolutely hideous, but the concept looks interesting. I feel inspired to start ripping my one apart.

[Troglodyte]

Hi , take a look on my mods of the c521 here:
http://www.homecinema-fr.com/forum/v...php?t=29849689
(it's in french but with photos )
In place of your mcap i've put elna silmic II on coupling +mkp+silvered mica etc...(details if you want ),a new clock , new AOP LM4562 ,9400µf for the 12v supply , glue on the bridge like you , and in future new supply with LM317
for each section (i working on it ).
Advices or questions are welcome
Regards

[Nebby]

Nice job on the mods! Wish I could do stuff like that

I don't want to go overboard modding this player since I'm saving the good stuff for a DIY DAC, probably something like the DDDAC1543 MK2.

I've seen that DAC on DDD's site; it looks pretty promising. Have you heard it yourself and do you know if it's capable of balanced outputs?

[ECM]

Try biasing the opamps into class A. This did wonders in my cheap sony DVD player. I used a pair of jfets.