Marantz CD63 & CD67 mods list

[poynton]

Ferrites

Hi.

Ideally, ferrites / chokes should be positioned right next to the chip. [ minimum distance ]

Andy

 

[ash_dac]

Re: Ferrites

Hi.

Ideally, ferrites / chokes should be positioned right next to the chip. [ minimum distance ]

Andy

Is that your cd63 on ebay ?

 

[poynton]

two of the many !!!!!

I still have 6 left plus the '43, '53 and the numerous CD60, Seimens RA400, Kenwoods, CD303. CD104s, cd304 [1+2] etc

Oh, I forgot - the CD4000 and the 2 B&O CD-X

you can't move in my garage !

 

[ash_dac]

two of the many !!!!!

I still have 6 left plus the '43, '53 and the numerous CD60, Seimens RA400, Kenwoods, CD303. CD104s, cd304 [1+2] etc

..and the cdm1 mech's

 

[poynton]

..and the cdm1 mech's

Didn't I mention the CDM's ? or the CD204?

 

[ash_dac]

Use the PWM outputs?

Hi,

Would it be possible to feed the PWM outputs into a half-bridge amplifier MOSFET stage, and LPF ?

Then I wouldn't need an amp !

http://users.ece.gatech.edu/~mleach/ece4435/f01/ClassD2.pdf

Or have I had too many beers!

 

[poynton]

Re: Use the PWM outputs?

Hi,

Would it be possible to feed the PWM outputs into a half-bridge amplifier MOSFET stage, and LPF ?

Then I wouldn't need an amp !

http://users.ece.gatech.edu/~mleach/ece4435/f01/ClassD2.pdf

Or have I had too many beers!

Hi.

Since the balanced inpt power amp is essentially the same as a balanced input op-amp, the answer is a [ guarded ] YES !

How about incorporating a T-AMP or TDA1554 and psu inside the chassis?

Andy

 

[ash_dac]

Re: Re: Use the PWM outputs?

Hi.

Since the balanced inpt power amp is essentially the same as a balanced input op-amp, the answer is a [ guarded ] YES !

How about incorporating a T-AMP or TDA1554 and psu inside the chassis?

Andy

Hmm. Thanks Andy.

TDA1554 looks interesting, and is quite cheap. If I added sockets in the Marantz...might get one of them since I got paid today.

 

[Fidelity Audio]

FAO RAY......

Ray as you know I have the OPA627 and OPA132 combo on browndogs.

I have not done any bypassing on them yet. And now is the time lol

I have the two Audiocom super regs directly on the op amps and 4 Black Gate FK 16V 470uF caps.

The noise should be pretty low, so do you still recommend I need bypassing on the opamp pcb?

I was looking at using BG FK 16V 33uf or 47uF caps or do you recommend a different value you have found works better.

Also something like a 220nF film resistor to decouple + and - 12V, is this also advantagous.

cheers

Brent

 

[philpoole]

Hi Brent,

How close are you going to put these caps to the opamps?
Can you get them on the browndogs?

Cheers,
Phil

 

[Fidelity Audio]

Hi Brent,

How close are you going to put these caps to the opamps?
Can you get them on the browndogs?

Cheers,
Phil

I WILL get them on browndog. Should be able to solder them on top

I am going to try a 4x OPA627 setup first to compare and then bypass.

Should get op amps tomorrow from Farnell (I have a few spare browndogs just waiting for them)

Brent

 

[philpoole]

I now have all the bits for the discrete output stage - inspired by Ray (there are differences, for starters, his works, lol).

Really hoping to get it done soon, but never getting the chance to fire up the iron.

Ray, what kind of bypassing are you doing on your output stage?

 

[Fidelity Audio]

I now have all the bits for the discrete output stage - inspired by Ray (there are differences, for starters, his works, lol).

Really hoping to get it done soon, but never getting the chance to fire up the iron.

Ray, what kind of bypassing are you doing on your output stage?

Can't wait to see the results mate.

I also noticed you have the lovely Yamaha DSP-E800, I replaced all 6 op amps with OPA2134 and the seperation and sound from satalite was like dvd. Very impressive.

Brent

 

[SimontY]

Good to see the thread warming up again

OT - I also have the E800 - that makes at least three of us with E800 and CD63

wooh!

 

[philpoole]

That Yamaha is a cracking bit of kit isn't it?
Brent, we're getting off thread here, but what did you do to your 751s? Just the crossovers?


Cheers,
Phil

 

[Fidelity Audio]

That Yamaha is a cracking bit of kit isn't it?
Brent, we're getting off thread here, but what did you do to your 751s? Just the crossovers?


Cheers,
Phil

I used better quality caps and rewired from xover to drivers with same wire as speaker wire going to it.

Better treble detail. I also filled my mission stands with sand. Bit excessive for rears but hey why not lol.

Brent

 

[6h5c]

FAO RAY......

The noise should be pretty low, so do you still recommend I need bypassing on the opamp pcb?

I was looking at using BG FK 16V 33uf or 47uF caps or do you recommend a different value you have found works better.

Also something like a 220nF film resistor to decouple + and - 12V, is this also advantagous.

cheers

Brent

Hi Brent,

I didn't use any decoupling directly on the BD pcb's yet , but I've put a 220n PPS cap between pins 4 and 8 on the bottom of the player's PCB. I have replaced the original electrolytics with 220u/16V BG's. I'd say, give it a try and see how it sounds!

Regards,

Ray.

 

[Fidelity Audio]

Hi Brent,

I didn't use any decoupling directly on the BD pcb's yet , but I've put a 220n PPS cap between pins 4 and 8 on the bottom of the player's PCB. I have replaced the original electrolytics with 220u/16V BG's. I'd say, give it a try and see how it sounds!

Regards,

Ray.

Ray you disapoint me LOL

Ill drop in the 4x 627 to see what I prefer and then i'll try bypassing

Brent

 

[6h5c]

I now have all the bits for the discrete output stage - inspired by Ray (there are differences, for starters, his works, lol).

Really hoping to get it done soon, but never getting the chance to fire up the iron.

Ray, what kind of bypassing are you doing on your output stage?

Hi Phil!

Doesn't work?? How's that possible ? Did you screw it up ?

For now, I use the on-board regulators for the discrete stage, which are LM317/337 BTW. Then the series inductors (220uH) and four Elna Silmics that I stole from the output caps. Sounds quite nice for a prototype .

In the definitive version I want to use Black Gates, and maybe a differential FET input stage. When my FET's arrive i'm going to start testing that.

My new CD57 arrived yesterday
Another virgin PCB waiting to be mounted....

Regards,

Ray.

 

[6h5c]

Ray you disapoint me LOL

Ill drop in the 4x 627 to see what I prefer and then i'll try bypassing

Brent

Hey, what can I say, i'm not into opamps anymore anyway....

Ray.