Marantz CD63 & CD67 mods list

[Fidelity Audio]

Originally posted by imperfectcircle
Ive also notices the power tranny runs very hot, i dont know if it did before the mods or not?? is it normal?

No it is wrong, start looking for why too much current is being dragged from the tx, they should run luke warm and thats it.
You dont want to fry your tx so take care and dont leave it on too long until you find out whats causing it.

Brent

[Fidelity Audio]

On a lighter note I purchased a Russ Andrews Torlyte isolation platform off ebay.
All I can say is WOW. So much stereo seperation and detail right from the instance I slid it under my cd player.
This is a recommended item.

http://www.russandrews.com/product.a...MOKKUKRLFWOVXD

Brent

[Fidelity Audio]

I am messing with some regs on a CD63SE and I am happy with the result.
I purchased some smt 7805 (LM78L05ACM/NOPB) and am running these with nothing other than 4x 220uF FC for the dac and decoder.
I am finding the audio to be better than with T0220 packge ones, better seperation and timing.

Brent

[disco]

Originally posted by imperfectcircle
So you think maybe the 1000uf/16v caps for the opamps are slowing down the sound? Maybe ill go back to the 100uf -220uf caps. Ill have to order some I dont have any of that size left, maybe ill got with some blackgates there

It's indeed a bad idea to place large caps after a highly loaded transformer. Audible problems regarding attack and distortion are to be expected.
The PSU has to deliver fast peaks to make your CDP sound 'fast'. In the plain CD63 the 12V PSU is quite poor. Building a beafier PSU for your opamps with a new (15-0-15@500mA) tranny, 8x Schottky's, 2x 1000uF, low drop regs and two 220uF BG's will improve reproduction. Note: 10 times more power than needed!

Originally posted by imperfectcircle
Ive also notices the power tranny runs very hot, i dont know if it did before the mods or not?? is it normal?

You probably own the standard CD63 which is equipped with a cheap tranny. Its load is calculated to run cool with the factory supplied caps. As you increase capacitance the load rises and so does the heat. Once you build new PSUs this problem is fixed by bringing back the big reservoirs to appropriate proportions.

Brent is right, your CDP might suffer from an electrical problem. What fuses are in now?

[disco]

Originally posted by rowemeister
I am messing with some regs on a CD63SE and I am happy with the result.
I purchased some smt 7805 (LM78L05ACM/NOPB) and am running these with nothing other than 4x 220uF FC for the dac and decoder.
I am finding the audio to be better than with T0220 packge ones, better seperation and timing.

Brent

Cool Brent

There's only a few mA to deliver, why not. Did you put -like before- 20cm cords between your PSU and the load?

Regards, Jaap

[Fidelity Audio]

Originally posted by disco


Cool Brent

There's only a few mA to deliver, why not. Did you put -like before- 20cm cords between your PSU and the load?

Regards, Jaap

So far all ive done is use croc leads to the relevent resistors and drop those FC caps.
I have tried each voltage rail individually and (no real suprise) the DAC analogue rail gave the biggest improvement.

Brent

[imperfectcircle]

You probably own the standard CD63 which is equipped with a cheap tranny. Its load is calculated to run cool with the factory supplied caps. As you increase capacitance the load rises and so does the heat. Once you build new PSUs this problem is fixed by bringing back the big reservoirs to appropriate proportions

I have a spare tranny from a cd63se would this be an upgrade over the one in my cd53??

The fuses are replacement stock size 1.6amp 125v. The tranny runs hot but not so hot I can touch it or anything like that. The player sounds awesome so u doubt anything severe is wrong, it could just be the hot weather weve been having its been in the mid 90's all week, even my Exposure XV integrated which is a very cool running class B design has been getting pretty hot.

[imperfectcircle]

Ive been thinking of an outboard supply for the analogue stage. Is there big gains to be had with this mod? Does running the opamps at 15v offer a performance advantaGEover 12V? About what size transformer would I want, would a small 20va be sufficeint?
thanks
Frank

[imperfectcircle]

dual power supply

What do you think of something like this for the opamp supply?? he sells the pcbs for about $35. It looks liek a pretty nice design with jung super regs?? Id prefer to use a proven design and buy the pcb then try and design my own from scratch. Any other pcbs or kits for a dual regulated supply?

[Malefoda]

Hi fellows,

here is what I get from some gentle workmates...

Got also more AD8620 ( friends want some ) and a ferrite for flat cables ( usefull for the player ? ).
I wanna know where to use the dampen material, first to load the mecanism ? And then the bottom of the case ?
Also I am now quite scared if I do the Ray's mods list my tranny will suffer... I own a simple CD53... is it dangerous ?