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Marantz CD63 & CD67 mods list
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Old 9th October 2007, 03:37 PM   #7921
6h5c is offline 6h5c  Netherlands
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Quote:
Originally posted by RCruz
Hi

Can you elucidate me on the real function of the Servo Chip, so I can understand the way this mod can affect the sound ?
...
Thank you for your comments.

Regards
Hi Ricardo,

The servo chip is the circuit that controls the driving of the laser pickup. It drives the sled-motor and controls the up/down (focus) and left/right (radial) movement of the laserlens. It is not directly involved in processing the data-signal for audio, but you can imagine a stable servo will contribute to a good HF signal that comes off the CD.

Regards,

Ray
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Old 9th October 2007, 03:46 PM   #7922
RCruz is online now RCruz  Switzerland
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Thank you Ray

I will report my mods relating this subject...

I have another pertinent question:

You suggest replacing the psu diodes (CD 53 SE) with 11DQ10 schottky and I did so in the digital area with great results (more detail and overal definition).

I want to replace the ones in the analog PSU but I am considering the alternatives : HFA08TB60 EXFRED or BYW98-200 fast rectifier diodes.

Can you briefly explain the possible differences and results.

best regards
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Old 9th October 2007, 08:52 PM   #7923
RCruz is online now RCruz  Switzerland
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Quote:
Originally posted by 6h5c


Nah, I don't think you'll damage anything. Just give it a try and see how it sounds, if you don't like it you can always take it out

Ray
Hi Ray

The C120 and C122 are now 2200uF/6,3v Rubycon MCZ and I have better L/R separation and more detail in the upper bass.

The bass that went away with the C505 2200pF Styroflex is back



Can you advise on replacing C124 (VREF out) ?

Can this mod create a ressonance or malfunction ?

Regards
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Old 10th October 2007, 07:20 AM   #7924
Thomo is offline Thomo  United Kingdom
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Just saying thanks for the help Brent. That problem was due to bad ac from overheating tx. Cheers mate.

Lee.
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Old 10th October 2007, 07:55 AM   #7925
Fidelity Audio is offline Fidelity Audio  England
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Superb mate

Brent
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Old 10th October 2007, 09:55 AM   #7926
Thomo is offline Thomo  United Kingdom
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On the "SuperRaygulator", is it best to have the capacitance multiplier or a good-quality cap on the input? Which has the faster response or is quieter?

Lee.
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Old 10th October 2007, 09:57 AM   #7927
6h5c is offline 6h5c  Netherlands
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Quote:
Originally posted by RCruz
...
I want to replace the ones in the analog PSU but I am considering the alternatives : HFA08TB60 EXFRED or BYW98-200 fast rectifier diodes.

Can you briefly explain the possible differences and results.
...
Can you advise on replacing C124 (VREF out) ?

Can this mod create a ressonance or malfunction ?

Regards
Hi Ricardo,

I would go for the 11DQ10 (or MBR1100) schottky; the other ones are diodes with controlled reverse recovery and are very fast, which isn't very nescessary here since we're rectifying only 50Hz. The schottkys are fast as well, without virtually any recovery problems, so it doesn't have to be controlled either .
But some have reported good gains using the other diodes, although I think the HEXFRED's are a bit of a hype ATM. They're nice in a switch-mode power-supply .

C124 can be upgraded, but don't make it too big. If the reference voltage comes up too slow it could cause funny side effects. A 100u/16V Pana FC will do fine there, no need for fancy BG's.

Regards,

Ray
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Old 10th October 2007, 12:26 PM   #7928
RCruz is online now RCruz  Switzerland
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Quote:
Originally posted by RCruz

You suggest replacing the psu diodes (CD 53 SE) with 11DQ10 schottky and I did so in the digital area with great results (more detail and overal definition).

I want to replace the ones in the analog PSU but I am considering the alternatives : HFA08TB60 EXFRED or BYW98-200 fast rectifier diodes.

Can you briefly explain the possible differences and results.

Can anyone comment on this ?
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Old 10th October 2007, 12:28 PM   #7929
RCruz is online now RCruz  Switzerland
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Quote:
Originally posted by 6h5c


Hi Ricardo,

I would go for the 11DQ10 (or MBR1100) schottky; the other ones are diodes with controlled reverse recovery and are very fast, which isn't very nescessary here since we're rectifying only 50Hz. The schottkys are fast as well, without virtually any recovery problems, so it doesn't have to be controlled either .
But some have reported good gains using the other diodes, although I think the HEXFRED's are a bit of a hype ATM. They're nice in a switch-mode power-supply .

C124 can be upgraded, but don't make it too big. If the reference voltage comes up too slow it could cause funny side effects. A 100u/16V Pana FC will do fine there, no need for fancy BG's.

Regards,

Ray
Thank you again Ray
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Old 10th October 2007, 12:32 PM   #7930
SimontY is offline SimontY  United Kingdom
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Default Diodes

Quote:
Originally posted by RCruz
Can anyone comment on this ?
Just buy the HEXFREDs. It will give you peace of mind that you are using what some people consider to be the best-sounding, including Audiocom. The difference will be subtle.

Simon
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