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Old 27th February 2006, 04:44 AM   #1021
awpagan is offline awpagan  Australia
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Quote:
Originally posted by mickie
Help..!

After my last mod i have strong noise on the output of my cd-67 if the volume of the amp is turned up fully and CD-Player is in stop or pause - which wasn't before (dead quiet!)

OK, what i did was the following:

-replaced all diodes (D801..804, DN 01..04, D811..12) with
Schottky and HFA08TB60;
-replaced C801/802, C811/812 with 0,1uF BG NX 50V
-removed C659/660
-removed R657/658 (jumper)
-replaced R659/660 with 100R (caddock)
-removed muting transistors (QN05-08)

I'm a bit in panic now, may i have damaged something..!?!

May this be related to the muting-transistors?
Sound is OK though...

Rest of the Output-stage is still untouched...

yours,
Mickie

mickie, don't panic
thought somone would have replyed by now, they probably busy.
we'll try to help out

need to get home to my schematics first.
"-replaced C801/802, C811/812 with 0,1uF BG NX 50V"
with 0.1uF? what size did you take out?

allan
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Old 27th February 2006, 06:16 AM   #1022
awpagan is offline awpagan  Australia
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mickie

disregard this line
"-replaced C801/802, C811/812 with 0,1uF BG NX 50V"
with 0.1uF? what size did you take out?

I was thinking of different caps

Q can you measure the voltage on the output ( rca's sockets)

allan
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Old 27th February 2006, 07:30 AM   #1023
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Quote:
Originally posted by mickie
Help..!

After my last mod i have strong noise on the output of my cd-67 if the volume of the amp is turned up fully and CD-Player is in stop or pause - which wasn't before (dead quiet!)

OK, what i did was the following:

-replaced all diodes (D801..804, DN 01..04, D811..12) with
Schottky and HFA08TB60;
-replaced C801/802, C811/812 with 0,1uF BG NX 50V
-removed C659/660
-removed R657/658 (jumper)
-replaced R659/660 with 100R (caddock)
-removed muting transistors (QN05-08)

I'm a bit in panic now, may i have damaged something..!?!

May this be related to the muting-transistors?
Sound is OK though...

Rest of the Output-stage is still untouched...

yours,
Mickie
Hi Mickie

Mine does this when my amp is at full vol. The noise disappears when I turn the vol back to 2-3 pm position.
It is because you have removed the muting transistors - dont worry.
Mine goes alot quieter when in pause mode when compared to stop.
I am going to fit a relay to mine (not taken the lid off for 1 week, and i'm missing it lol).

P.S I have 22mV on the outputs in stop mode and in playmode 4-8 mV (depending on amplitude of the music).
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Old 27th February 2006, 08:21 AM   #1024
6h5c is offline 6h5c  Netherlands
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Quote:
Originally posted by avr300
Hi again

2 questions:

1. Have any of you re-used the SILMIC's from the DC blocking for OPAMP capacitor instead of the Clerafine?

2. How's the sound of the 63 with the kwak-clock, compared to standard XO.

/avr300
Quote:
I could refine my question.

Would you go for the Kwak or the Tent (in diy version)?

Hopefully, neither of these takes out the magic of the CDP ?
Hi avr,

1. At first, I replaced the opamp's Cerafines with the Silmic's but it didn't make much difference. A good low-ESR cap with bypassing or a BG sounds much better there. What's silk doing in a cap anyway? Do they expect it to sound "smoother"?? Smells like HDAM: marketing stuff...

2. The Kwak and the Tent clock both bring considerable improvement to the sound. More quiet background, extended highs, more detail. I have both, but it's hard to say which one's better. Neither takes out the magic, they add magic!
The Kwak is the cheapest to build, but more work, and the Tent XO is very simple, but a bit more expensive.

Regards,

Ray.
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Old 27th February 2006, 08:31 AM   #1025
6h5c is offline 6h5c  Netherlands
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Default Re: Analogue supply to the DAC

Quote:
Originally posted by ash_dac
Hi,

Does the analogue supply provide voltage references to the op amp.. ? (It looks as though from the SM5872 datasheet)

It seems 5V in, and 1.4v out according to the marantz cd63 service manual.
Hi Ashley,

It's not a reference, more like a DC offset. The outputs of the DAC seem to be at 2.5V, because the duty-cycle of the output is 50% at no signal. That "offset" is divided by the low-pass filter at the outputs and that leaves 1.4V on the opamp's inputs.

Regards,

Ray.
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Old 27th February 2006, 08:38 AM   #1026
6h5c is offline 6h5c  Netherlands
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Quote:
Originally posted by mickie
After my last mod i have strong noise on the output of my cd-67 if the volume of the amp is turned up fully and CD-Player is in stop or pause - which wasn't before (dead quiet!)
Hi mickie,

I have that noise too, seems to be normal.

Quote:
-replaced C801/802, C811/812 with 0,1uF BG NX 50V
BG Nx to replace those ceramics???
A bit over-the-top, don't you think so?

Regards,

Ray.
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Old 27th February 2006, 10:38 AM   #1027
poynton is offline poynton  United Kingdom
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Quote:
Originally posted by adfinni

I just wanted a little help with what tools, and cables il need to do the mods.



poynton advised me to get the VE58N, and WB01B from maplins, to use as a PSU for the superclock. Are those those the only two things i need for the seperate PSU, and what sort of wiring will i need to complete the mod? (Sos im a noob, and don't want to screw it up)

Thanks

Hi.
The transformer WB01B is small and could easily be fitted to the chassis. The power supply may need careful fixing to prevent shorts to the chassis or other components. The output wires from the transformer only need soldering to the board as it is complete with rectifiers etc. Connect the clock module to the output. The mains wires may need extending and soldering to the existing mains input.

Otherwise , send me an email and we may be able to do a deal with one of my ready made modules?

Andy
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Old 27th February 2006, 10:49 AM   #1028
poynton is offline poynton  United Kingdom
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Quote:
Originally posted by 6h5c
................. What's silk doing in a cap anyway? Do they expect it to sound "smoother"?? Smells like HDAM: marketing stuff..........

Quote:
Originally posted by 6h5c
.............BG Nx to replace those ceramics??? ...............

There is a lot of hype around, isn't there?

If Marantz had got the spec of the '63 right in the first place, they would not have needed the Dham module! But then there would not have been the '43, '53, SE etc.

Silmics and Cerafines are ( like Black Gates) recommended for certain applications and not others. I have doubts about the BG supercap - if it works for BG, why not other makes of NP caps?

Andy
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Old 27th February 2006, 10:51 AM   #1029
mickie is offline mickie  Germany
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Thanx guys,
....so you have noise too...hmmm...are you shure this doesn't affect the signal / sound quality?

Noise begins at volume turned up to "12 o'clock"

I agree with "over the top" but i thought this is what we are doing anyway
I have some 0,1uF BG's lying around from my old Rega in which i implemented them successfully, noise-level went noticeably down...so why not use them.....

Allright, when modded fully, the player should be quieter at all i hope...

yours,
mickie
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Old 27th February 2006, 10:55 AM   #1030
poynton is offline poynton  United Kingdom
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Quote:
Originally posted by mickie
Thanx guys,
....so you have noise too...hmmm...are you shure this doesn't affect the signal / sound quality?

The noise was there before but since it was muted by the muting transistors etc, you did not here it on pause or stop..... but it was there!

Andy
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