Marantz CD63 & CD67 mods list - Page 1750 - diyAudio
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Old 22nd September 2011, 01:00 PM   #17491
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As long as you use good parts then yes it is better by quite a long way.

I have been tempted for quite some time to try a opamp based output pcb with filter from Dos and a single channel LME49710HA just to see what it sounds like. I suspect it will sound very good, better than a well fettled dos i'm not sure

Brent
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Old 22nd September 2011, 01:36 PM   #17492
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Swapped the Tacman carbon resistors on dos filter back to the Welwyn RC55Y 0.1% metal film from old pcb to see what difference there is between the two.

The accuracy and snap on snare drums is back to what I had before, they offer more ambiance to the upper mids and treble too. Strangely though the bass has become deeper as this was not expected. I am going to leave the metal films in.

Brent

Last edited by Fidelity Audio; 22nd September 2011 at 01:43 PM.
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Old 22nd September 2011, 02:32 PM   #17493
SimontY is offline SimontY  United Kingdom
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Hi-Fi Coll say those metal ones are good for bass. Do you mean Takman carbons?
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Old 22nd September 2011, 02:55 PM   #17494
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Err do you mean did I use Takman carbons before swapping back to Welwyn metal films? If so the yes I did

Brent
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Old 22nd September 2011, 03:22 PM   #17495
Thomo is offline Thomo  United Kingdom
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That cdp sounds annoyingly good again now, lol. Those component changes today have brought all the musicality and smoothness back.

The level of detail and reality it conjures up is really quite staggering. Really sinks home how far I still have to go with my own player.

Lee.
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Old 22nd September 2011, 03:35 PM   #17496
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With these tweaks I am leaning towards saying the Dos is now better than my old one! I of course have to run it at home for the proper test but i'm sure the CFP has made improvements to overall transparency and drive.

Brent
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Old 22nd September 2011, 05:05 PM   #17497
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I could never figure this out for myself. I hope you don't mind me copying your parts list when you're done, Brent?

I put 2 regs on my servo control IC last night, separating analogue and digital lines. I listened at low volume for a couple of hours and never heard it skip, so fingers crossed. I also put one on the CPU. The improvement has been pretty staggering. I plan to do the driver ICs next.

Am I missing any good places for 5v regs? I built 2 more that I am not using. I have 4 on DAC, 3 on decoder, 2 on servo, 1 on CPU.
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Old 22nd September 2011, 05:11 PM   #17498
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Hi Ben,

You could put one on the HF amp but I'd be surprised if you hear big gains.

Simon
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Old 22nd September 2011, 06:03 PM   #17499
UV101 is offline UV101  England
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I'd put one on the hf amp and one on the transport ;-)

Looking forward to getting last bits to finish the dos. Hopefully they'll arrive tomorrow ;-)

Alan, one thing you will need with the dos is decent output caps. ;-)
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Old 22nd September 2011, 06:27 PM   #17500
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2SC2240 could be replaced with 2SC1841 or 2SC1845 and 2SA970 could be replaced with 2SA992. They are more modern devices and have a very low Cob.
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