Marantz CD63 & CD67 mods list

[Fidelity Audio]

After some listening yesterday evening I must see this is a major mod, big difference in sound, wow what a bass, everything comes alive more and the articulation is much better.

Excellent, next up the servo reg mod for more bass and wonderful treble 😀

Brent

 

[Fidelity Audio]

This one has four 1.4 - 12V outputs @10mA. Ripple 6mV.
Based on Micrel 29302 regs.

Thats pretty good mate, the Audiocom super regs are supposed to be less than 1mV and a max of 300mA current with heatsink.

Brent

 

[SimontY]

magic smoke this morning!

I think it's time to send her to Brent

 

[poynton]

magic smoke this morning!

I think it's time to send her to Brent

It has spread up the M1 from Nottingham !

 

[SimontY]

It has spread up the M1 from Nottingham !

Hehe, yep, it has. It's my turn to go one step too far. I am basically a bit of a novice and this servo mod isn't for the beginner.

Last night I turned it on and there was no smoke, but it didn't work. It clicked a few times and span the wrong way. Today I turned it on and there were more funny noises, soon followed by nasty smelly electrical smoke.

I don't even know what smoked. 😕

 

[Fidelity Audio]

magic smoke this morning!

I think it's time to send her to Brent

No probs mate. Ill sort display out too.

Brent

 

[navin]

All KI have the copper chassis, the special one you mentioned was copper everywhere.

The photo of your KI looked like was copper everywhere. 🙂 anyway loved the detail in your mod list. wow! i am astonished!

 

[Fidelity Audio]

The photo of your KI looked like was copper everywhere. 🙂 anyway loved the detail in your mod list. wow! i am astonished!

I did post a pic of an all copper one (CD63 KI DP) but its not mine.
Mine will sound much better anyway lol

Brent

 

[SimontY]

It has spread up the M1 from Nottingham !

It's now travelled further north to Doncaster! lol

Into the drydock for the CD63Mk2 KI-PL!

 

[Fidelity Audio]

It's now travelled further north to Doncaster! lol

Into the drydock for the CD63Mk2 KI-PL!

Hopefully it will be sorted for the small journey south west back to Sheffield 😉

Brent

 

[disco]

I did post a pic of an all copper one (CD63 KI DP) but its not mine.
Mine will sound much better anyway lol
Brent

This copper look is just spray (it's sold in car shops).

 

[disco]

Just the sort of thing I had in mind 😀 Couldn't one dab some enamel on the silver?
Si

Knew a guy overhere who did exhaustive testing on this subject. The ultra thin silver he used for signal wires was flattened and painted with laquer for wooden floors. Fast drying, hard paint. Donno the brand name.

Personally I don't expect the rather large signal to be influenced by the choice of copper or silver. I see it as a good practice to keep ground lines low-ohmic. Maybe the starground would benefit from silver?

Jaap

 

[Fidelity Audio]

Knew a guy overhere who did exhaustive testing on this subject. The ultra thin silver he used for signal wires was flattened and painted with laquer for wooden floors. Fast drying, hard paint. Donno the brand name.

Personally I don't expect the rather large signal to be influenced by the choice of copper or silver. I see it as a good practice to keep ground lines low-ohmic. Maybe the starground would benefit from silver?

Jaap

I used silver loaded solder on my star ground

Brent

 

[disco]

I used silver loaded solder on my star ground
Brent

Silver gives a strong bond. When constructing cases from solid copper I use 5/95 AgSn. Very good for binding components to their copper heatsink too.

 

[disco]

Here is a drawing of Divide by 2 circuit:
http://www.diyaudio.com/forums/attachment.php?s=&postid=911118&action=thumb&stamp=1147102756

and of wiring to pins:
http://www.diyaudio.com/forums/attachment.php?s=&postid=911120&action=thumb&stamp=1147102824

Also you mentioned you cannot find a 74LS74, Farnell in the UK have them. Also remember you need a D type Flip Flop with both normal and inverted output.
Brent

Didn't do much with IC's the last 20 years so I wondered if the SN74ALS74N can replace the mentioned 74LS74.

Jaap

 

[Fidelity Audio]

Didn't do much with IC's the last 20 years so I wondered if the SN74ALS74N can replace the mentioned 74LS74.

Jaap

Yes its fine mate and here is a snap shot of pin outs.

Its exactly the same

Brent

 

[poynton]

More Improvements

Hi.

As well as the caps across the rectifier diodes, has anyone tried caps across the actual windings?

It may be difficult with the standard transformer but should be possible with extra Txs.

Values shown are 4.7uF/100v Pana. ECQ Polyester

Andy

 

[Fidelity Audio]

Re: More Improvements

Hi.

As well as the caps across the rectifier diodes, has anyone tried caps across the actual windings?

It may be difficult with the standard transformer but should be possible with extra Txs.

Values shown are 4.7uF/100v Pana. ECQ Polyester

Andy

Not tried that. Interested to hear of any gains.

Brent

 

[martin clark]

Caps across the diodes alone will change things, but not necessarily improve them. Here's a really good (if rather technical) read on the art of snubbing, or why you should consider adding a series resistor with the caps:

http://hagtech.com/pdf/snubber.pdf

 

[disco]

Caps across the diodes alone will change things, but not necessarily improve them. Here's a really good (if rather technical) read on the art of snubbing, or why you should consider adding a series resistor with the caps:
http://hagtech.com/pdf/snubber.pdf

Nice reading Martin.
I guess one could experiment with a 500mHz osciloscope and a given value for Cs by varying the value for the resistor?

Regards Jaap