Marantz CD63 & CD67 mods list

[gy21]

Originally posted by rowemeister


Off the top of my head these are the mods that helped the most.

Cheap easy and good mods first.

1) opamps
2) Bypass Hdam and output caps
3) Seperate regs for DAC and Decoder
4) Upgrade caps around DAC and Decoder to Pana FC or similar
5) coax
6) Damping of chassis
7) Decoupling around opamps etc
8) Muting removal
9) Removed caps from opamps to Headphone circuit

Cheap and a little more complex



Best mods price not so important.

1) Seperate regs on as many v lines as possible
2) Clock
3) good opamp
4) Bypass HDAM and output caps
5) seperate PSU for regs
6) Black gate caps
7) change caps on servo and opamps to silver mica types with good low tol resistors
8) A star earth
9) Coax
10) Damping

The list goes on but this is pretty much my top 10

Brent

Thanks Brent, that gives me a really good insight

[disco]

Originally posted by SimontY

Err, it's actually OP249, sorry.
http://uk.farnell.com/jsp/endecaSear...U=401195&N=401

http://www.analog.com/en/prod/0,,759_786_OP249,00.html

and

http://www.njr.co.jp/pdf/ae/ae04028.pdf

[SimontY]

Evening fellow modders,

I'm taking another look at my dead display. I swapped D851 for a new diode and replaced Q851 with a 7912. Neither of these changes made any difference.

The reg voltages are:

1- 0 (ground)
2- -37
3- -26

Just as it was before I changed the reg to a -12. I have no idea what's going on with it

Ok, measured more:

R854 measures -26v EACH side.
D853 reads 725mV in the diode test.

Simon

[ash_dac]

Originally posted by SimontY
Anyone tried OPA249 (says OP249 on chip, 'GP' type)?

It's a DIL-8 op-amp, which I bought on impulse from Farnell, partly to get my order over the minimum for a card spend. The specs are nothing special but I believe some have said the sound is good.

I might drop them in place of my LM6172s to see what they're like..

Simon

Simon,

Thanks for this. I've been using the AD712 in my Philips cd723 as per this suggestion http://www.diyaudio.com/forums/showt...305#post384305

The OP249 is described as a replacement for AD712.

Have you tried AD8620 ? (edit: corrected from AD8260)

[gy21]

My "soic to dip8" socket doesn't fit my quality dip socket wich is on the board. The feet of the "soic to dip8" are to thick for the qulaitu dip8 socket.

Now i'm thinking to put the soic to dip8 socket in a cheaper dip socket, wich has thin feet and to put the cheap socket in the quality dip8 socket?

Later on i can always solder the "soic to dip8" socket straight onto the board

[SimontY]

Originally posted by ash_dac


Simon,

Thanks for this. I've been using the AD712 in my Philips cd723 as per this suggestion http://www.diyaudio.com/forums/showt...305#post384305

The OP249 is described as a replacement for AD712.

Have you tried AD8260 ?

Hi,

I've not tried that chip, yet..

[gy21]

Originally posted by gy21
My "soic to dip8" socket doesn't fit my quality dip socket wich is on the board. The feet of the "soic to dip8" are to thick for the qulaitu dip8 socket.

Now i'm thinking to put the soic to dip8 socket in a cheaper dip socket, wich has thin feet and to put the cheap socket in the quality dip8 socket?

Later on i can always solder the "soic to dip8" socket straight onto the board

Just tried it, at least it works, i'm not sure it degrades the sound quality a lot.

Finally i'm listening to the AD8620

[ash_dac]

Originally posted by gy21


Just tried it, at least it works, i'm not sure it degrades the sound quality a lot.

Finally i'm listening to the AD8620

How does it sound?

[gy21]

after a first listen I can see why people recommend it. it sounds way better then the AD826 and opa2134, the other two opamps i have tried.

Especially in the highs.

[avr300]

Originally posted by gy21
after a first listen I can see why people recommend it. it sounds way better then the AD826 and opa2134, the other two opamps i have tried.

Especially in the highs.

As one have said - "beats them all" !