Marantz CD63 & CD67 mods list

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#5,781
Re: Re: Re: OFF TOPIC - schroeder diffuser

SimontY said:


Hi Aquar,

Firstly, I think it's good that you've put a diffuser between your speakers, I'd imagine that helps things a lot.

Secondly, if your rear wall is 4 metres away from your listening position it's probably not a huge problem. But if you can, try experimenting with a diffuser or some sort of furniture/objects that will do a similar, if less effective, job.

Simon
Click to expand...

Hi Simon
Tks for your advise, I will do it soon.


Regards
aquar
 
#5,782
aquar said:
Ouuups.....I'm sory.
BTW, this morning I measured in the reg. circuit (running with 12V DC suplly) and I got:
1. Output = 4.94 V
2. Between zener - ground = 0.8 V (2 zener in seri = 1.6 V)
3. Between LED - zener (LED pin+ / LED pin-) = 2.1 V
4. Between adj.pin - ground = 3.7V

Here is the pic ( sory with a bit blur.....by phone cellular)
Click to expand...

What's the voltage value of the two zeners? Looks like you've connected them in reverse (conducting forward, like a normal diode), since there's only 0.8V across each of them, like I said earlier. You can use two 1N4148 or similar diodes instead, or leave it in this way. As long as you get the desired 5V 😀. The LED is ok, 2.1V is a normal forward voltage for a green one.

Ray
 
#5,789
Alright ... I just exchanged the OPAMPS for the LM4562NA ... And the sound is tighter.

A tighter bass and highs ... but it seems I lost a little detail.

Is this possible ?

Would better caps around OPAMPS solve this ?

(for that matter, what do better caps DO for the OPAMPS/Sound ?)
 
#5,790
This thread is tooooooooooooooo long 😀

I've just got hold of a CD63SE to play with. I'd like to try the LM4562 but struggling to source it in the UK, anybody any ideas?

Also..........Is there a list of what you guys have been doing over the last 4000000 posts?? just a general overview really??
 
#5,791
TDLofCC said:
Alright ... I just exchanged the OPAMPS for the LM4562NA ... And the sound is tighter.

A tighter bass and highs ... but it seems I lost a little detail.

Is this possible ?

Would better caps around OPAMPS solve this ?

(for that matter, what do better caps DO for the OPAMPS/Sound ?)
Click to expand...

Let the op amp settle in for a week first. It is a very neutral opamp with no gain in one or two particular areas. BG caps are superb around the opamp in the marantz gear.

Brent
 
#5,792
stueyh said:
This thread is tooooooooooooooo long 😀

I've just got hold of a CD63SE to play with. I'd like to try the LM4562 but struggling to source it in the UK, anybody any ideas?

Also..........Is there a list of what you guys have been doing over the last 4000000 posts?? just a general overview really??
Click to expand...

Hi and welcome to the thread.

The op amps are sourced from National Semiconductors and you can order 3 sample ones for free. I have actually ordered 40 from them direct but the lead time is 4 weeks.

Brent
 
#5,793
rowemeister said:


Let the op amp settle in for a week first. It is a very neutral opamp with no gain in one or two particular areas. BG caps are superb around the opamp in the marantz gear.

Brent
Click to expand...

Yeah, I figured that ... Because the sound got better when I was listening to more CDs last night 😉

But ... can someone tell me what those caps around the OPAMPS DO for the sound in since of quality/detail/bass/etc ?


rowemeister said:

The op amps are sourced from National Semiconductors and you can order 3 sample ones for free. I have actually ordered 40 from them direct but the lead time is 4 weeks.

Brent
Click to expand...

Not anymore ... you have to pay shipping and handling because they are now in high demand ...

Cost me $22 to send to the Netherlands. $1.79 for the OPAMPS themselves, and the rest was shipping/handling from Singapore 😛
 
#5,795
TDLofCC said:


Not anymore ... you have to pay shipping and handling because they are now in high demand ...

Cost me $22 to send to the Netherlands. $1.79 for the OPAMPS themselves, and the rest was shipping/handling from Singapore 😛
Click to expand...


What you pay depends on your email address!!

I originally received 4 samples FOC.
Then I had to pay postage and packing for the next 2 lots of 3.

Andy
 
#5,797
My Mods - successfully 'complete'

I have just completed replacing my CD-63 KI op-amps with AN823s, and am faily well blown away by the difference.

So much more controlled bass, much tighter and drier sound, and much less confusion in the upper-mid during complex tracks. I can hear much more information in the tracks too which is a bit spookey.

This complements well the Net-Audio Rockclock2 upgrade made last year.

I also tried the cheaper OPA2604, which offered no real improvement over the original op-amps.

I wonder if anyone has swapped out AN823s for LM4562s or one the more expensive models i.e. OPA627


Though....I am still to find a torroidal transformer replacement - I killed my transformer during the RockClock upgrade, and was sent for free a CD-63 transformer by a very kind forum member.

Any other quick-win improvements that I should make?

Cheers.
 
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