Marantz CD63 & CD67 mods list

[6h5c]

Hi.

I believe that HF ripple reduction is better if you use many smaller caps rather than 1 large value.

ESR's are in parallel, inductances are smaller etc.

Yeah, you're right about that.

Thanks Ray,

About 6dB and 15dB

Andy

Here you go!
The top two curves are the modified-constant-group-delay CD63 and CD67 Marantz curves (out1, blue and out2, red). The other two (out3, black and out4, grey) are your passive filter sections with 4.7mH inductor.
I couldn't help the 1k05 and 1k15, since the smaller inductor makes the damping quite critical. It will have a 10% tolerance in the real world, so somewhere between 1k and 1k2 will do the job. Hard to tell what the actual inductancy will be.

Regards,

Ray.

 

[adfinni]

Hi Ad,

Yes, you're right, those parts lists can get pretty long...
That's the main reason I made my mods lists, to keep track of things
Rubycons are very nice, especially the ZA/ZL(H) series. They have very low impedance. Where are you going to order your stuff, RS?

Regards,

Ray.

I'm looking at getting rubycon ZL's for the Power supply area, at C803/804, C805/806, C813, C814, and C815.
Il get some more rubycon ZL's to put around the op-amps at CD15/CD16, CD04, CD07

Ah screw it, im getting rubycons throughout

ray: im ordering all these things from farnell.

 

[6h5c]

Cool move dude

At Farnell you can choose between like a zillion different types....
I like Farnell.....
They sell 10mH inductors.....

Ray.

 

[adfinni]

Ye i love it, great store. Many caps by a certain company on their way to me to put into my little 'ruby' CDP

 

[Fidelity Audio]

I thought that might be a typo

How about a bit of CLC or LC, between regs

problem voltage drop?

allan

Yes voltage drop is an issue, ive tried it before and got 0.4 - 0.5 drop.

Hi Brent,

Why don't you use the adjustable version?
I don't like the idea of lifting the regs reference with a noisy zener . This will be transferred to the output.
It will also enable you to decouple the adjust-pin and get better rejection ratio .

Why do you use two 3300uF BG's and two MKT's? Is there a lot of wire between them?

Ray.

I have adj version here as I used them for servo , hf and rf regs

I have those caps here so thought I would use them, maybe a little overkill.

So Ray the zener will be too noisy even with those caps and audiocom reg?

I could use that reg plus a few schottkys in series, I only need 3 or so volts extra.

 

[6h5c]

I have adj version here as I used them for servo , hf and rf regs
I have those caps here so thought I would use them, maybe a little overkill.
So Ray the zener will be too noisy even with those caps and audiocom reg?
I could use that reg plus a few schottkys in series, I only need 3 or so volts extra.

Hi Brent,

Well, one thing's for sure: a zener is more noisy than no zener. I would avoid it if I had a choice, the less noise the better. Especially since it is in series with the reg's ground-pin. The output gets lifted by whatever that zener produces....

And there's the adjust-pin that can be decoupled.

Regards,

Ray.

 

[Fidelity Audio]

Hi Brent,

Well, one thing's for sure: a zener is more noisy than no zener. I would avoid it if I had a choice, the less noise the better. Especially since it is in series with the reg's ground-pin. The output gets lifted by whatever that zener produces....

And there's the adjust-pin that can be decoupled.

Regards,

Ray.

Yeah your right Ray. The whole point of doing this is to eliminate noise .lol

I must have got too exited about extra psu mods

 

[poynton]

Yeah your right Ray. The whole point of doing this is to eliminate noise .lol

I must have got too exited about extra psu mods

Hi,

Why not use something like this instead of 'conventional' regulators??

Andy

 

[Fidelity Audio]

Hi,

Why not use something like this instead of 'conventional' regulators??

Andy

Its a posibility and I do have scr's here. Thing is I already have the Audiocom reg and BG FK caps running the clock now, all I was doing was adding extra reg and caps before it, something very simple.

Although its a very good idea

 

[Luke]

heres a low noise one i found on the forum. Cant comment on sound cos Im still awaiting my clock, but with a pot its easy to adjust the voltage.

 

[Luke]

hello rowemeister

Hey on a side note, I read one of your threads about modding PM66KI and inspired me to buy a PM78 that needs some work.

http://www.diyaudio.com/forums/showthread.php?postid=860282#post860282

Any ideas?

cheers arthur

 

[poynton]

Its a posibility and I do have scr's here. Thing is I already have the Audiocom reg and BG FK caps running the clock now, all I was doing was adding extra reg and caps before it, something very simple.

Although its a very good idea

TL531 is a low noise adjustable shunt regulator.

This circuit is use by Elso Kwak for his clock.

Andy

 

[Fidelity Audio]

Re: hello rowemeister

Hey on a side note, I read one of your threads about modding PM66KI and inspired me to buy a PM78 that needs some work.

http://www.diyaudio.com/forums/showthread.php?postid=860282#post860282

Any ideas?

cheers arthur

Hi not sure on the PM78 mate. When you do get a sch diagram let us know and we can have a look for you.

TL531 is a low noise adjustable shunt regulator.

This circuit is use by Elso Kwak for his clock.

Andy

Ahhhh should work a treat then

 

[Luke]

Hi not sure on the PM78 mate. When you do get a sch diagram let us know and we can have a look for you.

Will do, hows your Russian

 

[Dr.Gone]

TL531 is a low noise adjustable shunt regulator.

This circuit is use by Elso Kwak for his clock.

Andy

TL531? The schematic refers to a TL431. Did I miss something?

Regards,
Jacco

 

[Fidelity Audio]

Will do, hows your Russian

Im brilliant at not understanding Russian

Here is an update on the reg, now using an adjustable LM1086 with protection diode and ripple filter caps.

 

[philpoole]

TL531? The schematic refers to a TL431. Did I miss something?

Its the TL431 that I use in my Kwak Clock.

This circuit seems to work well. However, surely a monolithic voltage regulator typically has an internal opamp of sorts using feedback to ensure the voltage is constant? I've always assumed the latter would be better than this circuit (even though I use it - just following Elso's schematic).

 

[Fidelity Audio]

Just in case people have not seen.

A good read and insite for beginners.

http://cgi.ebay.co.uk/ws/eBayISAPI....sPageName=MERC_VIC_RSCC_Pr4_PcY_BIN_Stores_IT

 

[awpagan]

Just in case people have not seen.

A good read and insite for beginners.

http://cgi.ebay.co.uk/ws/eBayISAPI....sPageName=MERC_VIC_RSCC_Pr4_PcY_BIN_Stores_IT

They even put super regs on the DAMH???

I must be missing something

Still undersided about output transformers

allan

 

[poynton]

Its the TL431 that I use in my Kwak Clock.

This circuit seems to work well. However, surely a monolithic voltage regulator typically has an internal opamp of sorts using feedback to ensure the voltage is constant? I've always assumed the latter would be better than this circuit (even though I use it - just following Elso's schematic).

Hi, has everyone read this ?


http://tangentsoft.net/elec/opamp-linreg.html


The audiocom superreg is a Sulzer .

They even put super regs on the DAMH???

I must be missing something

Still undersided about output transformers

allan

Well, they have to do something to justify the price !!

Andy