Marantz CD63 & CD67 mods list

[poynton]

Originally posted by 6h5c




Andy,

How's your tubestage going?

Regards,

Ray.

Hi.

Waiting on some components - should have it running at the weekend.

Andy

[Fidelity Audio]

I have been listening to my HF RF and Servo upgrades over the last two days.

I will say every single part of the music has improved.
It's not like when you change the op amps or when you do the HDAM it's more subtle.
The treble is more controlled, the mid is smoother and the resonance in the bass is a lot better.

I do believe this mod will only truley shine once the op amp hdam regs clock stuff is done first. I think it would be wasted otherwise.

These three mods need to be done on the 63 as all three circuits are connected to each other.

I recommend........

Now roll on servo hf rf reg pcb lol

and valve output

oneday it wil all end

[poynton]

[i]...............

oneday it wil all end

................[/B]

I was thinking overnight that one area we have overlooked so far is the type of plastic that the front panel is made of!
We could have some custom made in carbonfibre composite with copper interwoven to provide a Gaussian screen.

Oh, the vans just arrived with those nice men in white coats....

[awpagan]

now i've done it
i'am going to have to read this whole thread

I've been looking for another cdp to mod.
already have cd850 (yes the classic)mk1 i've been modding eg clock.opamps mute etc
Am going to do psu, i2s out, etc
just needed spare cdplayer just in case i stuffed it for a while

i just got myself a cd67
very good condition, not very old or used.
sound? not bad, but is totally stock
Has a lot of promise.

Could be an interesting project?
which one can better the easiest and/or overall.

allan

[6h5c]

Hi Allan,

The CD67 is a very interesting project indeed. I don't know the CD850, but the TDA1541 DAC is very nice. If you search this forum you will find lots of info on it.

You can find some interesting info on both DAC's in Thorsten's article.

In my CD57 mod's list you will find an overview of lots of mod's on this player. The CD57 uses the same PCB.

You'd better take some time off to digest this thread .

Regards,

Ray.

[awpagan]

yeh ray
up to post 120
"Hmm, looks like guano to me...."

I've often said my bro's electric welding looks like pelican Guano to me.
like my soldering used to be
or still is

the cd850 uses decoder saa7310 dig-filter saa7220 dac saa7321
but i like them

the cd67 uses decoder saa7372 filter+dac sm7372

just found data sheet for saa7372 has i2s out? future reference!

just a thought about the hdam circuit
how about bypass opamps and use the fet for dac?
similar to pass's xbosoz

or pass's IV output stage?

[awpagan]

have to find the cd67 manual link
need better look at analogue out circuit

allan

[6h5c]

Originally posted by awpagan
the cd850 uses decoder saa7310 dig-filter saa7220 dac saa7321
but i like them

Hm, I thought it was the 1541....maybe that is MKII?

just found data sheet for saa7372 has i2s out? future reference!

In the CD63 and 67 the oversampling is done in the SM5872 DAC, so the data out of the 7372 is non-os .

just a thought about the hdam circuit
how about bypass opamps and use the fet for dac?
or pass's IV output stage?

Yeah, that could be possible. But you'll have to use some kind of passive filtering. But the HDAM will not combine the signal of both outputs of the DAC.
IV stage is not possible for this DAC, since it has PWM voltage outputs

Ray.

[awpagan]

up to post 350 now, very interesting reading
will continue tomorrow

?your 3 pin power plug iec socket, earth or grd point

won't a star earth be useful?

every voltage is relative to earth

if no earth in cdplayer, electrons will find the lowest resistance back to earth.
maybe throught the ground on the output rca's to the amp's earth.

a thought since the earth circuit in the board is all over the place.

and before you say neutral for earth
neutral can be very noisey.


back to reading
custom transformer?

allan

ps hmmmm passive

[6h5c]

Hi Allan,

The idea to ground the player was born from the fact that I have a tubeamp that is grounded, for obvious safety reasons. I didn't want the ground current to travel through the interlinks shield. So I decided to ground (or "earth") the player and create a second low resistance path and see what happens. With the risk of creating a humming ground-loop, but fortunately the whole setup is mouse-quiet .

I chose to ground the player at the output's ground star-point. If you take a look at the layout you can see all the PSU ground traces go there. The ground layout is not the best in this player, but this seemed like the only sensible place....

Ray.