Marantz CD63 & CD67 mods list - Page 1867 - diyAudio
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Old 26th October 2012, 01:41 PM   #18661
qusp is offline qusp  Australia
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this would be very prone to noise pickup
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Old 26th October 2012, 02:18 PM   #18662
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this would be very prone to noise pickup
Thanks and that was what I had in mind when I had this idea.
BUT I need to know from someone who has actually done this before and I want to to hear from them the actual result, whether good or bad.
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Old 27th October 2012, 08:35 AM   #18663
6h5c is offline 6h5c  Netherlands
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Hi,

You can clock two chips with the Flea, one on each output. If you use tightly twisted wire or thin coax, you will have no noise issues.

Just make sure you disable the PCB track that runs on the board from the DAC to the decoder, a lot of people forget that. Remove RD14 and a few wire-jumpers. If you leave the unused trace connected to the clock signal at one side, then you'll have a noise-antenna :-)

If you are using a CD57/67, make sure to connect the clock to the other side of R104, which would be pin 21 (CRIN) of the SAA7372. Marantz used pin 22 (CROUT)
The schematic is correct, but look at the board traces...

Ray
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Last edited by 6h5c; 27th October 2012 at 08:49 AM.
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Old 27th October 2012, 05:43 PM   #18664
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Originally Posted by 6h5c View Post
Hi,

You can clock two chips with the Flea, one on each output.I

Ray
Thanks Ray. Great !! I don't realize that your Flea got two outputs, one for DAC and the other for Decoder until you mentioned it and then I looked it up in the manual.

BTW are the two O/Ps just connected together without any buffered separation ?
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Old 27th October 2012, 06:02 PM   #18665
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Today I finished connecting the three Tx onto my CD63 and they work like a charm. I have posted up a few photos to show what I have done so far.

You can see my 4X22000uF smoothing capacitors and their leads are surrounded by copper foils which I have earthed to get rid of interference. The case is also heavily damped. The analogue rails are fitted with Korean built +15V and -15V low noise voltage regulators. Two Burson discrete opamps are fitted. You can also see that most of the capacitors are changed to Rubycon ZLG, Sanyo SEPC and WIMA caps. The sound quality is really nice and the bass is so tight and deep.

When Ray's two low jitter clocks arrive I will feed independent 16.xx and 8.xxMhz signals to the DAC and the Decoder as well as the servo. Afterwards I will build five low noise voltage regulators using LT-1763-5 to provide independent power supply to the servo, DAC and Decoder etc. Then I think the mod is considered complete by that time.
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Old 27th October 2012, 08:15 PM   #18666
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I forgot to mention that all rectifier diodes were changed to Vishay 1n5062.
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Old 27th October 2012, 11:04 PM   #18667
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Default re cap

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Originally Posted by higlander View Post
I forgot to mention that all rectifier diodes were changed to Vishay 1n5062.
The leads from your caps are way too long.Copper aint gonna help.??
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Old 28th October 2012, 07:18 AM   #18668
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Hey guys, just an update on the individual DAC analogue PSU. Definitely subtle gains for the cost and, perhaps more importantly, space. However, after a few days with it, I feel as though it sounds tonally the same but less distorted and more capable, similar to when I doubled up the transformers in my amp (a la Brent). Definitely a worthwhile mod but only after other PSU and clock mods, I'd say.
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Old 28th October 2012, 03:09 PM   #18669
6h5c is offline 6h5c  Netherlands
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Quote:
Originally Posted by higlander View Post
Thanks Ray. Great !! I don't realize that your Flea got two outputs, one for DAC and the other for Decoder until you mentioned it and then I looked it up in the manual.

BTW are the two O/Ps just connected together without any buffered separation ?
The outputs are not buffered, but connected to the output of the Tentlabs XO through a 33R resistor.
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Old 29th October 2012, 04:21 PM   #18670
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Hi Ray,
Today I changed C813 caps to 10,000uf/25v Mundorf AG. I felt it becomes dry, treble is totally rolled of, earlier I had Nichicon FW 4700uf. Is it because of the value is too much than required? Or it need time to burn in?

Thanks
Badri
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