Marantz CD63 & CD67 mods list

[UV101]

Hey, hey, post nr. 14000!!!

awesome! and indeed!

 

[poynton]

Hey, hey, post nr. 14000!!!

A good thread you started here, mate !!!


Andy


.

 

[Malefoda]

Yep, I can't agree more!

 

[RCruz]

I agree.... This is the main thread !!!

 

[Fidelity Audio]

I use a C-L-C filter with a 32+32uF (2.5mohm) and a 100+100uF (0.8mohm), and behind that a 50+50uF (1.6mohm) for the driver and preamp stage. All are the radial HV types.

<STRIKE>I think you have a typo on your website, 22 ohm is a bit high </STRIKE>

EDIT: ESR is measured at 100Hz with these, but a few mohm is low, could they really be that low??? I just copied the numbers from the Mundorf datasheet... Your's look more feasable Brent.

Ray

Hi Ray

Mundorf had a typo on some their pdfs, originally their 25V 22000uF stated 0.22 ohm which was too low. The updated sheet then stated 22 ohm. Comparing that with a 25V 22000 BHC Aerovox with 48 ohm @ 100Hz.

Those Oscon SEPC 6.3V 470uF I use on digital rails have an esr of 0.07 ohm @ 100Khz & ripple rated @ 5600 mA!!

Great thread this, I can't see it dying for quite a long time yet.

Brent

 

[martin clark]

25V 22000 BHC Aerovox with 48 ohm @ 100Hz.

Those numbers all have to be mOhm, the reactance of a 22000uF cap at 100Hz is only 0.07ohms!

 

[RCruz]

There is really a big difference between 22 ohm and 22mohm.

I guess 22mohm look low but would not 22ohm make the caps too slow for audio ?

 

[Thomo]

yeh, that's another Mundorf typo, lol.

Definitely mOhm

 

[Fidelity Audio]

Those numbers all have to be mOhm, the reactance of a 22000uF cap at 100Hz is only 0.07ohms!

I looked at the figures and emailed F&T and they confirmed Mundorf had got it wrong. So the figure is 22 mOhm. Thanks for pointing that out guys.

Brent

 

[RCruz]

Well, in that case these caps must really sound very good.

IMO, low ESR is fundamental for overall definition.

In attach you can find my collection of low ESR caps with values.

Recently found a BC components (Philips) 22.000uF 63v with 5mohm ESR !

 

[Fidelity Audio]

That's why I picked them, they are superb on clock psus as well as pre reg smoothers on analogue psu.

One of the best uses for these (or similar) is the +10V (raw) rail in the CD63.

Brent

 

[RCruz]

One of the best uses for these (or similar) is the +10V (raw) rail in the CD63.

Well... this might be just what I was looking for.

What about the -10v rail... can we benefit from upgrading the cap before the main +5vreg ?

 

[Fidelity Audio]

I usually fit a 16V 4700uF Pana FC for the -10V rail. Fitting the 22000uF onto the pcb for the +v rail takes up a bit of room and leaves very little for the -ve rail. The +v rail is under much more load than the -ve rail too.

Brent

 

[Malefoda]

There are many spam about "get it 2 inches bigger", it's audio caps?

 

[RCruz]

Bigger caps sound better in some cases !

 

[Malefoda]

I know, just kidding

 

[riccardo]

coax mod

Hello all.
What about coax mod between Dac and decoder, and eventually for HF signal path?
I'm looking for some "Know how" about it.
Thanks.
R

 

[SimontY]

Back when a cd63 was my main music maker I had a coax run doing the HF signal from the mech board to the main pcb. It covers quite a lot of ground and saves the signal from going through a lot of pcb traces and a connector or two.

It makes the sound a lot more analogue, removing harshness and grit. Some call this type of improvement a reduction in digitalitis.

Simon

 

[riccardo]

Thanks, i would make something similar in a cd 67 (included Clock signal to decoder) but i'm not shure HOW i could make these mods.
....

 

[SimontY]

Someone on here will remember, or I can look at the service manual later, just leaving the office now! I think the receiving end is R501 but would have to check...