Marantz CD63 & CD67 mods list

[6h5c]

Originally Posted by studiostevus

Ray, I connected everything. I now have one of the original 100ohm resistors between the the hdam-bypass and the RCA's. Volume is pretty low now, for my understanding, what are the other side-effects from having this 100ohm instead of your recommended 47ohm?

(didn't have a 47ohm here, just a 40 or 100)

There shouldn't be any side-effects. 40 ohm, 47ohm, 100ohm, that really shouldn't matter much in sound level. Volume should be just as loud as with the HDAM in place. In the original player, there's 2x 100ohm in series, so theoretically it should be louder now

Are you sure you have everything connected properly? Opamp output > 100 ohm > output socket

Ray

[RCruz]

Originally Posted by Malefoda

How do you know if it's balanced or not? I think it is as it looks symetrical...

Ricardo why not a new thread! That may be exciting =)

It has balanced outputs

How can I start a new thread ?

[grofus]

Hi all, I'm Steve. Yes, another one. I need some advice. I have upgraded the diodes to schottky and in doing so the display has ceased to function. I read somewhere on here another member had the same problem. I just need to know where to start looking as i'm a novice. The player works fine with great sound apart from the display. Any ideas welcome. Great forum by the way. Thanks, Steve

[Malefoda]

Just clic Digital Source - diyAudio then "new thread". It's always nice to see good players back to life
Ok let's check Studiostevus work, sorry for ot Ray!

[studiostevus]

Double checked it... I measured with DMM 100ohm between the start of the bypass and the RCA's, so should be fine. Maybe it's the new opamps that are a bit quieter.

So.. where do we stand:
- muting circuit removed
- muting caps gone
- Raygulators for the +/- 12V rails
- LM4562 opamps
- Bypassed HDAM

What's the best thing to follow?
Clock?
Or are there some more caps to remove/change (In a SE version) ?

[Glenn2]

Originally Posted by Malefoda

Lee,
I would be very happy if you can tell me how you spiced your TDA1547



How do you know if it's balanced or not? I think it is as it looks symetrical...
Right now I plan on using an extrenal single opamps like top Analog Device or National Semi to do the work of the internal ones and the DOS it.

Again, I'm begging all you even if have different points of view (that makes us more rich!) on my Philips CD951 • A DAC7 (TDA1547) vs TDA1541A R1 vs SM5872 story ! Promise I won't do (too soon...) commercial break for my church again

Ricardo why not a new thread! That may be exciting =)

I was talking about PCM56 in the Denon.
And I wasn't talking about external op-amps, I was talking about the I/V opamps INSIDE the PCM56. You can take I-out before these or V-out after these as the both signals have output pins.

[RCruz]

Originally Posted by studiostevus

What's the best thing to follow?
Clock?

Just follow Ray´s list....

Next thing I would do is replace the stock 7805 main +5v reg by a LM340AT... That should give an overall boost right now.

[6h5c]

Originally Posted by grofus

Hi all, I'm Steve. Yes, another one. I need some advice. I have upgraded the diodes to schottky and in doing so the display has ceased to function. I read somewhere on here another member had the same problem. I just need to know where to start looking as i'm a novice. The player works fine with great sound apart from the display. Any ideas welcome. Great forum by the way. Thanks, Steve

Hi Steve,

You can check if the negative display voltage is present at Q851. It should have about -24V at the output.

Ray

[stevief198]

Ian,

thanks again.

what rating for the caps 16V or 35V?

really grateful for the help,

Steve

[grofus]

Originally Posted by 6h5c

Hi Steve,

You can check if the negative display voltage is present at Q851. It should have about -24V at the output.

Ray

Thanks Ray, I will check that tomorrow