Marantz CD63 & CD67 mods list

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#12,862
Thanks guys! 😉

According to all of You.....the winner is LM4562! 😀

@Malefoda:
Don't know but I'll see.....:scratch2:,....and again, thanks for advices and suggestions!

Also I'll be free to ask any help related with mods of 67SE.....and thanks for that guys!:cheers:
Hear you soon!


P.S. I'll inform You about any progress in sound!
 
#12,863
jhmee9 said:
Actually, noise is audible when you got ear right on the tweeter,
and as I said, sounds like "less noise" phono input.
Maybe.... that's the reason why is now sound so "open" 😀

Thanks again,...to all of You!😉
Click to expand...

That noise has always been present, only it was muted by the muting transistors during stop and pause. It is residual noise of the DAC. Like Brent wrote: if you want to get rid of it, install a muting relay to restore the muting function.

Some players also generate clicks and pops when switched on or off. This is normal, and was also covered up by the muting circuit.

My vote: pls. do not use OPA2604, your player deserves better :yes:

Ray
 
#12,865
I have a spare ezDAC PCB here that's partially built. I already did some experiments and hooked it up to a CD72 through the I2S lines. It works perfectly!

So now i'm thinking about fitting it permanently, and using the variable output for the ezDAC. It's a future project. I'll leave the fixed output intact for the TDA1547, that will make a nice A-B comparison. It will be the first CDM4 based player with 96/24 upsampling 😀

Ray.
 
#12,866
I tried a TDA1543 on the I2S lines, just for a taste of NOS.

Sounded very romantic and real with stuff like Norah Jones but complex music did not sound good.

Apart from old multibit DACs, any DAC that supports I2S and 384Fs clocking should work fine.

It might be interesting to try one of the Twisted Pear boards as they take I2S in and are easily configurable. Not the ESS Sabre ones, but the WM8741 and PCM1794 ones. They are quite cheap (very if you get the PCB only).
 
#12,871
Malefoda said:
Jhmee you should take advantage of sample programs around (LME49720HA included (top version of the LM4562)) to get parts.

An externally hosted image should be here but it was not working when we last tested it.
Click to expand...

Hi Matt

Would you please explain how do you do that ?

As a particular DIY modder, I could never get a positive answer from any OEM regarding samples.....

😱

Ricardo
 
#12,872
rowemeister said:
Hi Ray

Excellent. Are you going to try it in your sacd player to run it in first and give your impressions.

hope you like it

Brent
Click to expand...

I only examined it very briefly, because I was home late last night. The PCB looks very good. I see you assembled it by hand, that must be very time consuming. And the LEDs look very cool 😎 😀

Dunno yet what i'm going to do first. It's not very busy here at work ATM, due to the summer holidays, so maybe i'll measure it first. I think i'm objective enough not to let the results influence the listening test :angel:

But before that happens, i'll power it up for a few days.

Ray
 
#12,873
Hi Ricardo,

right now with my mail adress I can't have National stuff for free (wich I can with my former job corporate mail) but with Texas Instrument there is no problem, just register and fill things as "company name" with fancy info, like you were near to create a company and are doing a prototype. I think this is a very common issue in sample order's profile.
I wish I still have a corporate mail...

Talking regs, is it worth making LM317 based 5V for digital ICs? I'll do it for analog/dig DAC, clock ref., analog/dig filter but don't think it's worth it on µcon and servo... is it? Oh man I've also to do 4 for the DOS... I'll defo open a business 😉
 
#12,874
6h5c said:


I only examined it very briefly, because I was home late last night. The PCB looks very good. I see you assembled it by hand, that must be very time consuming. And the LEDs look very cool 😎 😀

Dunno yet what i'm going to do first. It's not very busy here at work ATM, due to the summer holidays, so maybe i'll measure it first. I think i'm objective enough not to let the results influence the listening test :angel:

But before that happens, i'll power it up for a few days.

Ray
Click to expand...

I get them assembled for me but yes by hand, I fit the oscillator and the 6 elco caps so that I can change freq etc. The leds do look cool yes 😉 the one on the 3.3v rail also acts as a load.

cheers
Brent
 
#12,876
Hmmmmm.....strange!:xeye:
Talking about "noise" mentioned before.....I found what causing that!
After I replaced fixed power-chord with IEC socket and connect ground wire to chassis......that kind of noise getting amplified, in fact when ground wire is disconnected from chassis, "noise" just disappear!!! :bigeyes:
Also I connected another "non-tweaked" CD player and do A-B comparison.....BINGO!...same level and usually "kind" of noise.....what means, everything is OK!
Really strange......what in case if I want to have IEC socket,...like I had? Just forget about it or solve it to be in function?
Does anybody before, had the same situation?

Any suggestion guys?

Thanks a lot!

@Malefoda:
Thanks for suggestion my friend.......I'll see.....😉
 
#12,877
You have caused an earth loop problem by earthing the mains to chassis gnd. I had a similar problem many years ago when all my equipment was connected to earth. My sky receiver was causing the problem due to its switch mode power supply.

Fit a 27ohm 2W resistor between chassis gnd and IEC earth. This isolates the two gnds but still allows the improvements. More than one item may need this doing

Brent
 
#12,878
Thanks Brent,
I suppose that...........power LED on my Onix OA601 is off when I connect ground wire on CD67 chassis! (and noise becoming audible)
When I disconnect ground wire from CD67 chassis, power LED on Onix OA601 is ON! (noise disappear.....)
I'll try with resistor but currently, I'm on "stock" power-cord.....

Cheers!
 
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