Marantz CD63 & CD67 mods list

[SimontY]

Would that be 'PCB Lifter' ?

Haha, see my sig - Pad Lifter! They come off so easily! lol

It has a better PCB layout, no servo chip, since that is integrated in the SAA with the decoder (no extra crystal or clocking required!), no discrete HF amps, and it uses a single regulated 5V supply for the driver IC's instead of the raw +/- 10V. So, ultimately, theoretically, I think a fully modded CD67 could beat an equally modded CD63 because the circuit is less complicated 😀. But then again, it's just a theory.

Or...when modded in a certain and very complete way maybe they will sound somewhat equal 😀

Well PCB layout could make the 67 better but Brent's theory tells of 63-superiority!

However, when all's said and done, the modding will always make more difference than minor original player differences!

 

[SimontY]

These wire jumper are tinned copper, fortunately. I always check with a magnet what has to stay or go.

Phew! Sort of a relief! lol Still, if I do another it will be tempting to replace them

 

[disco]

Phew! Sort of a relief! lol Still, if I do another it will be tempting to replace them

If you can lay hands on it take half mil silver or enamelled copper (for bobbins). The silver gets black over time but that doesn't hurt conducting.

 

[SimontY]

If you can lay hands on it take half mil silver or enamelled copper (for bobbins). The silver gets black over time but that doesn't hurt conducting.

Just the sort of thing I had in mind 😀 Couldn't one dab some enamel on the silver?

Si

 

[Fidelity Audio]

Yes, I do. It has a better PCB layout, no servo chip, since that is integrated in the SAA with the decoder (no extra crystal or clocking required!), no discrete HF amps, and it uses a single regulated 5V supply for the driver IC's instead of the raw +/- 10V. So, ultimately, theoretically, I think a fully modded CD67 could beat an equally modded CD63 because the circuit is less complicated 😀. But then again, it's just a theory.

Regards,

Ray.

Ray thats got me thinking again......what if I build +/- 12V supplies for the driver IC's rather than using the the raw 10V....mmmm

Brent

 

[SimontY]

Ray thats got me thinking again......what if I build +/- 12V supplies for the driver IC's rather than using the the raw 10V....mmmm

Brent

Hah! Another upgrade and another Reg or two! Warren G would be proud!

 

[Fidelity Audio]

hehe

Yes 'Regulate'

Brent

 

[SimontY]

lol

 

[disco]

Ray thats got me thinking again......what if I build +/- 12V supplies for the driver IC's rather than using the the raw 10V....mmmm
Brent

What would be left on the onboard 12V psu?

 

[Fidelity Audio]

What would be left on the onboard 12V psu?

I don't really have the onboard 12V. I have dedicated audiocoms right next to the opamps

Brent

 

[disco]

I don't really have the onboard 12V. I have dedicated audiocoms right next to the opamps
Brent

Do you have four of these regs for 12V supply or just two? 😀

Some regs need at least 10mA for good regulation though.

Jaap

 

[Fidelity Audio]

just the 2

Brent

 

[disco]

This one has four 1.4 - 12V outputs @10mA. Ripple 6mV.
Based on Micrel 29302 regs.

 

[SimontY]

No real surprise here, my first attempt at this flipflop clock feed thing doesn't work.

Extremely tired and ready for bed!

 

[navin]

Here is my mods list

thanks. BTW how come most CD63KI I see are black and you got that wonderful gold coloured one? I did see one of these being used by Ken Ishiwata himself at a CES. He told me this was his personal prototype but would not divulge more. Dont tell me you got your hands on it!

 

[6h5c]

Ray thats got me thinking again......what if I build +/- 12V supplies for the driver IC's rather than using the the raw 10V....mmmm

Brent

😀

Ray.

 

[poynton]

Ray thats got me thinking again......what if I build +/- 12V supplies for the driver IC's rather than using the the raw 10V....mmmm

Brent

In theory, the servo drivers do not require a regulated supply since they output a voltage according to the drive signal / VRef.

BUT... the main point to bear in mind ... these are the only supplies that are fused and for good reason... high current possibilities !

Any regulated supply MUST be able to source more than the blow current of the fuses. I would think a 3A supply would be adequate on each line otherwise your servos [ tray motor, etc] will not cope at peak demand. So the standard Audiocoms won't do !!!

Andy

 

[gy21]

Thanks guys! I just did the 3 7805 reg mod for the dac. It worked right away.

I Used 100uF/25 V and a 100nF (mylar) on the input of every 7805 and a 100uF/10V on the output of every 7805.

Now i'm listening 😉

After some listening yesterday evening I must see this is a major mod, big difference in sound, wow what a bass, everything comes alive more and the articulation is much better.

 

[Fidelity Audio]

thanks. BTW how come most CD63KI I see are black and you got that wonderful gold coloured one? I did see one of these being used by Ken Ishiwata himself at a CES. He told me this was his personal prototype but would not divulge more. Dont tell me you got your hands on it!

All KI have the copper chassis, the special one you mentioned was copper everywhere.
The SE and standard 63 have normal steel chassis.

Brent

 

[Fidelity Audio]

In theory, the servo drivers do not require a regulated supply since they output a voltage according to the drive signal / VRef.

BUT... the main point to bear in mind ... these are the only supplies that are fused and for good reason... high current possibilities !

Any regulated supply MUST be able to source more than the blow current of the fuses. I would think a 3A supply would be adequate on each line otherwise your servos [ tray motor, etc] will not cope at peak demand. So the standard Audiocoms won't do !!!

Andy

I was not going to use those regs for the reasons you say, and im not going to use the more expensive ones for that circuit either as that would be very over the top and pointless IMHO.

Brent