Marantz CD63 & CD67 mods list

[6h5c]

Originally posted by rowemeister
SIMON.

The four resistors R651 - 654 supply the two HDAM circuits with +/- 12V.

R617 and 618 are the audio input resistors, these need removing to stop audio entering the HDAM.

RH23 and 24 are the output resistors from the HDAM, removing these prevents audio going backwards into the HDAM.

Resistors R619/620 bypass the whole HDAM (like in the CD43/53)

Originally posted by rowemeister
The bypass resistors are not fitted on the CD63/SE/KI.

They are fitted to the CD43/53

Hi guys!

Thanks rowemeister, I have nothing to add to the above!
You will find the sound without HDAM more open and transparent.
It's one of the well-known veils that will be removed ;-)

A dedicated clock with proper PSU indeed works very well (another veil) ;-)

Regards,

Ray.

[SimontY]

Originally posted by 6h5c
You will find the sound without HDAM more open and transparent.
It's one of the well-known veils that will be removed ;-)

Well, now you've got my hopes up

Thanks for your quick reply and comment.

Could this effect be likened to comparing an active pre-amp with a passive one? I hope not, as this would mean a loss of bass and dynamics (but the benefits above). You may consider this question as rhetorical, as I fully intend to perform the surgery on my player and report sonic changes, if any.

Regards

[SimontY]

Originally posted by 6h5c
A dedicated clock with proper PSU indeed works very well (another veil) ;-)

Ahha, nice pic, and yes I entirely agree - a clock (only with fresh psu tho) transforms the player.

Might I humbly suggest you try OPA627bp on daughter-boards, as it looks like you're using OPA2132/4 or something (can't quite make it out). And 627 pees all over them.

Thanks.

[Fidelity Audio]

Ha very good. Nice pic.

I advise changing the regulators for an even better sound. Check Audiocom out on ebay.

Ill post some pics soon. Its under going more mods and may as well do the HDAM one too.

[6h5c]

Originally posted by SimontY


Ahha, nice pic, and yes I entirely agree - a clock (only with fresh psu tho) transforms the player.

Might I humbly suggest you try OPA627bp on daughter-boards, as it looks like you're using OPA2132/4 or something (can't quite make it out). And 627 pees all over them.

Thanks.

Hm, sharp vision you have... Don't worry, the 2134's are temporary, since this picture is made when the player was still on the workbench...

Regards,

Ray.

[Fidelity Audio]

whooo

Where did you get those?

I want some, please tell me....now!!!!

[6h5c]

Here's a list of some opamps and their data. I tried most of them in my CD67. The ones with some form of comment in the Pref. column are favorites. The data helps me to establish a relation between the numbers and the fact that a certain type sounds good.

Regards,

Ray.

[6h5c]

Originally posted by rowemeister
whooo

Where did you get those?

I want some, please tell me....now!!!!

You are not familiar with the BrownDog adapters yet???
http://www.cimarrontechnology.com/index.asp

This enables me to use dedicated single opamps after the DAC and in the analog filter.

Ray.

[Fidelity Audio]

cheers for that.

I currently use OPA2134 and I am very happy with them but I would'nt mind getting a pair of those Browndog pcbs with OPA627 fitted.

[SimontY]

Originally posted by 6h5c
Here's a list of some opamps and their data. I tried most of them in my CD67. The ones with some form of comment in the Pref. column are favorites. The data helps me to establish a relation between the numbers and the fact that a certain type sounds good.

Regards,

Ray.

Interesting, thanks for sharing. I see the 627bp is there ;-)

But not LM6172, Thorstoen's favourite when he modded this player. I bought this one to try but since 627bp was so mindblowingly good I didn't bother trying. I actually use LM6172 in my preamp, which gives a detailed heavyweight solid sound.