Marantz CD5400 clock replacement

[Guido Tent]

ah well, It works, so I guess it will be OK. The DAC will probably reclock everything to his own clock and will not care about how the data is delivered (within limits of course).

Essentially this is true when data is considered, but lower jitter in the SPDIF stream means lower jitter in the recovered clock inside the DAC. Remember any PLL is an attenuator, less garbage in - less garbage out.

I haven't found any DAC yet that is fully insensitive to its' SPDIF input.

best

 

[voodooless]

Who sais it's going to get SPDIF input?

It's directly connected from servo processor to DAC.

 

[voodooless]

Just to clarify how it works for the CD5400:

http://deepspace9.xs4all.nl/download/cd5400dac.png

 

[voodooless]

Well, here's my clock:

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

It has both an inverted and non inverted output. I'm going to check it first on my work tomorrow before I put it in. I know me

I also already changed the opams to AD8620, replaced the KA regulators for MC types. Those are four times less noisy. Replace the big caps with 4700 uF Panasonic FC's, and the smaller ones, after the regulators and by the opamps, and DAC with 220 uF 25 V rubbicon ZL. I also replace the rectifier diodes with schottky's. I also bypassed the elco's at the opamps with a 100nF ceramic cap, and also the diodes.

I notice a slightly better bass performance, and it appears to have more detail and seems quieter. But it's to ba that I don't have any reference (unmodded version) to compare with. I bet part of it is just my mind playing tricks with me

 

[voodooless]

Well, the clock seems to work:

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

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

The invertor output looks about the same (though inverted), so I guess the swings have more to do with the scope wirering..

I'm going to put it in later this evening.

 

[voodooless]

I'v got it hooked up now! And it works

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

 

[EC8010]

Great! Now, what do you think about the sound? (By the way, the ringing on the square wave is probably for the same reason that mine rang, 'scope ground lead inductance.)

 

[voodooless]

Well, it's hard to say what the sound is like. It was good before, and is good now. But with my headphones I think I notice that everything comes more loose from the headphones. It's as if the sound is not comming directly from the speakers. Sounds more natual. The rest is basicly the same I guess. It's to bad that I don't have any unmodded player to check the difference though. I'm alway's highly suspicious with these kinds of tweaks

 

[Guido Tent]

Well, it's hard to say what the sound is like. It was good before, and is good now. But with my headphones I think I notice that everything comes more loose from the headphones. It's as if the sound is not comming directly from the speakers. Sounds more natual. The rest is basicly the same I guess. It's to bad that I don't have any unmodded player to check the difference though. I'm alway's highly suspicious with these kinds of tweaks

Hi

Good to see all works like intended. Bear in mind that digital gear needs some days to run in again. Did you check the mains chord polarisation as well ?

best

 

[voodooless]

Did you check the mains chord polarisation as well ?

 

[Guido Tent]

there are 2 orientations to plug the mains plug in the wall, they both sound different.......

cheers

 

[voodooless]

How is that possible? And what is the difference?

 

[voodooless]

It might sound strage, but after the clockmod, it's as if the improved bass detail and response that were there after I replace the opamps are gone. I took the 12V supply voltage from the positive supply of the opamps. Could this have something to do with it?

 

[poynton]

there are 2 orientations to plug the mains plug in the wall, they both sound different.......

cheers

Only in countries with non-polarised mains supply !!

 

[EC8010]

Depends on where you took the 12V from; I took mine from close to the regulator, but if you took yours from near the op-amps, that might cause a noise problem.

 

[voodooless]

Depends on where you took the 12V from; I took mine from close to the regulator, but if you took yours from near the op-amps, that might cause a noise problem.

The + is very close to the regulator, the earth I took from a via near the DAC.

I could also take it at the big caps I guess (so before any regulator) , but the 7808 will get a bit hotter then I guess, but it should work just fine. I'll try tonight.

 

[Elso Kwak]

It might sound strage, but after the clockmod, it's as if the improved bass detail and response that were there after I replace the opamps are gone. I took the 12V supply voltage from the positive supply of the opamps. Could this have something to do with it?

Never take the clock supply from the analog section/supply of your player!

 

[voodooless]

Never take the clock supply from the analog section/supply of your player!

I could have guesst that

I'll take it from the PSU cap's before the regs then. I guess that should be okay? There is no other point to get it from. Or should I use a seperate supply al together?

 

[Elso Kwak]

I could have guesst that

I'll take it from the PSU cap's before the regs then. I guess that should be okay? There is no other point to get it from.

No take it from the raw DIGITAL supply of your player. Usually around +9V

I do not advocate using a separate supply but most clock mongers do.

 

[voodooless]

No take it from the raw DIGITAL supply of your player. Usually around +9V

Ah yes. Now I see. I thought they were all supplied from the same transformer coil, but they are not I see now.

Thanks Elso!