Marantz CD63 & CD67 mods list

[Fidelity Audio]

ahhh the custom TX

Whats happening with it. I will be needing some

[Dr.Gone]

Originally posted by poynton

And place an order for our custom transformer !

Andy [/B]

Ah... what is the status on that?

Regards,
Jacco

[ash_dac]

Hi,

Thanks for the advice!

I'm actually using the Marantz cd63 as a transport to a tda1543 NOS dac. Works fine as a transport.

I guess you lot managed to cure that boomy bass that my Marantz cd63 exhibits!

Looked at the dac datasheet now.

The dac has cmos op amps at the output powered by the noisy 5V !

The noise from the 5V is coupled directly to the audio outputs.

I see why you are buying a tx.

[SimontY]

Originally posted by ash_dac
I guess you lot managed to cure that boomy bass that my Marantz cd63 exhibits!

Hi, yes, but it takes a good few mods to fix:

- op-amps
- hard cone feet
- damping
- add-on clock with psu
- removal of dc blocking caps

All of these help to fix the bass. I think some people like the original 'boom n tizz' style sound. Too 'hi-fi' and not enough 'real music' for me tho

Btw guys I just had my transport out and took the HF board off. I cleaned any grease off that I could see, and of course gave the lens its routine wipe with a cotton bud wet with antistatic spray. I also antistatic'd lots of plastic in there, and generally got rid of any crap. It now hasn't skipped once that I've heard in about 20mins

[Fidelity Audio]

Sweet.
The curse of the dreaded hardening grease.

[awpagan]

Originally posted by poynton


It's cheaper!



And so is everything else that uses 5v !



See Rowe's posts - the pictures sum it up !
Basically, split the analog sections off, power by extra transformers and more regulators.

And place an order for our custom transformer !

Andy

How much noise are you measuring off the +5v rail

I put the scope on mine and Q811 with jamicon 4700Uf cap bypassed 0.1uF U208 earthed measured on leg of reg <.1mV noise

Q871, standard caps-c871 c813, no bypass cap earth point U267 10 to 17mV noise.

both measurement taken playing. and mV P-P

think i will try a bypass cap and measure again

allan

[Fidelity Audio]

The biggest problem is not the reg its self its the fact so many circuits use the same rail, each one putting noise and drain on the rail.

I have fitted cd63's with 3 extra 7805 to the DAC and Decoder on the relevent rails and the improvement in the sound is very good.

Do this mod with better regs and you are really laughing.

Ofcourse nice caps and bypassing will always improve things

The only way you can make this player noise free is to isolate all or most 5v rails. You may not measure all the noise on the reg either, there is probably noise say around the DAC - a localised noise where one circuit in the chip creates noise on the other.

I know when you look at what has to be done it looks a nightmare but really its not that hard.

[awpagan]

Originally posted by rowemeister
The biggest problem is not the reg its self its the fact so many circuits use the same rail, each one putting noise and drain on the rail.

I have fitted cd63's with 3 extra 7805 to the DAC and Decoder on the relevent rails and the improvement in the sound is very good.

Do this mod with better regs and you are really laughing.

Ofcourse nice caps and bypassing will always improve things

The only way you can make this player noise free is to isolate all or most 5v rails. You may not measure all the noise on the reg either, there is probably noise say around the DAC - a localised noise where one circuit in the chip creates noise on the other.

I know when you look at what has to be done it looks a nightmare but really its not that hard.

not to mention internal chip niose.

the low noise line i have is the same value noise anywhere in the same line.
simple things like choke and beads instead of link wires for voltage lines.

the noise(emf) from the tansformer inself is a pain in the ***.

allan

[Fidelity Audio]

Originally posted by awpagan


not to mention internal chip niose.

the low noise line i have is the same value noise anywhere in the same line.
simple things like choke and beads instead of link wires for voltage lines.

the noise(emf) from the tansformer inself is a pain in the ***.

allan

Allen do you have Standard/SE or KI.

The reason I ask is the KI has a toroidal tx and wondered how much less noise there is from it.

[awpagan]

Originally posted by rowemeister


Allen do you have Standard/SE or KI.

The reason I ask is the KI has a toroidal tx and wondered how much less noise there is from it.

I have a standard cd67

I need a decent transformer

allan