Marantz CD63 & CD67 mods list - Page 1924 - diyAudio
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Old 8th April 2013, 11:05 PM   #19231
hotiron is offline hotiron  Scotland
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Great stuff. Enjoy.
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Old 10th April 2013, 11:56 PM   #19232
dwjames is offline dwjames  England
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Quote:
Originally Posted by UV101 View Post
And it'll be even better if you regulate the new rails


Click the image to open in full size.

Click the image to open in full size.

This was using +/-8v from the original transformer, but you can use +/-12v regs if you are using a separate transformer and power supply.
So tonight I've added 3 x 7809 and 3 x 7909 regulators to the 3 servo driver ICs.
I was going to just add one of each onto U234 and U237 and feed all 3 ICs from 1 pair of regs until I realised that you can't really get to these jumpers properly if you have large C813 C814 caps...
Click the image to open in full size.

So I followed the pics above plus the excellent diagram here:
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Here's the regs all bent up with the grounds tinned and ready for fitting
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So I put them in like this
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this
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and this
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Sorted?
Well it fired up fine nicely and sounded good, but I measured the voltages at pin2 of each of the driver ICs and 2 of them showed 9v at pin 2 whilst the middle one was still at 18v. So I went back to the schematics and did a bit of head scratching and it seems that these 2 regs have the input and output the wrong way around.
Click the image to open in full size.

I can see how it's been done as I'm forever getting caught out by the fact that the schematic's a mirror opposite when you're viewing the board from above.

So I swapped those 2 regs to be round the other way:
Click the image to open in full size.

Click the image to open in full size.

And now it's allllll goooooood
Stable +&- 9v voltages at all 3 of the servo driver ICs.

I tidied up some of the wiring for the 5v regs and fitted a filtered EIC mains socket while I was at it. I also replaced the resistors R149 and R150 with wire jumpers too.
Click the image to open in full size.

It's sounding real nice now. Smooth, powerful, well rounded and with excellent imaging and wonderful detail

Hopefully the pics above are helpful to someone aiming to do the same.

Next on the cards is some loving from Ray.... I've got a Flea with XO for the DAC and decoder as I'm currently using the standard clock and oscillator, but with Martin Clark's mods. I've also ordered a DOS board. I'm going to try using the filter and differential summing part of Ray's DOS board, but just after that, before it goes to the last output transistor, divert out and use my valve output stage instead. It should be a wonderful partnership. Can't wait to find out...

James
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Old 11th April 2013, 07:22 AM   #19233
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Good work James
Have you thought of providing stable power supply to the DAC and decoder in additional to the servo ICs ? That will boost the performance to another level if you use low jitter external clocks to the servo and the DAC.
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Old 11th April 2013, 08:33 AM   #19234
6h5c is offline 6h5c  Netherlands
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Nice job!

Your XO has been ordered :-)

Ray
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Old 11th April 2013, 08:55 AM   #19235
dwjames is offline dwjames  England
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Quote:
Originally Posted by higlander View Post
Good work James
Have you thought of providing stable power supply to the DAC and decoder in additional to the servo ICs ? That will boost the performance to another level if you use low jitter external clocks to the servo and the DAC.
Thanks, yes, I'm currently using 3 x 7805 for the DAC with a smoothing cap on the input and a small resistor on the output to ensure good regulation even with these small loads. You can see in this crappy picture here:
Click the image to open in full size.
It's messy and I've been meaning to tidy them up for a while.

I was planning to put 2 more 7805 to the decoder, but then I thought maybe I would use LT1763 regs for all instead and make a little power supply board like others have done, but then I was a little concerned about having the regulation far away from the load and running it over long(ish) wires. I don't really know the best approach....
Obviously the best method is to use a load of Spower regs or similar, but I don't want to spend the money

Does a clock for the servo really make a big difference? Even with good power and regulation like I have now?
I might see if adding a divider circuit to the new clock for the dac and decoder degrades the clock output significantly.

Quote:
Originally Posted by 6h5c View Post
Nice job!
Your XO has been ordered :-)
Ray
Excellent, thanks
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Old 11th April 2013, 10:44 AM   #19236
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OH trust me, a decent low jitter clock makes a lot of difference to the SQ of your CD63.

From my experience the improvement is most noticeable by changing the stock TX with bigger VA transformers + BIG smoothing caps; then by changing the low jitter clocks; and follow by putting in low noise voltage regulators + good quality low and high filtering caps.
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Old 11th April 2013, 10:53 AM   #19237
dwjames is offline dwjames  England
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Quote:
Originally Posted by higlander View Post
OH trust me, a decent low jitter clock makes a lot of difference to the SQ of your CD63.
Thanks. I know the DAC and decoder will benefit a lot from a low jitter clock as the sound is much improved with just the Martin Clark mods to the standard clock.
But I would like to know if adding a low jitter clock to the servo as well will make that much of an audible difference?
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Old 11th April 2013, 12:03 PM   #19238
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Quote:
Originally Posted by dwjames View Post
Thanks. I know the DAC and decoder will benefit a lot from a low jitter clock as the sound is much improved with just the Martin Clark mods to the standard clock.
But I would like to know if adding a low jitter clock to the servo as well will make that much of an audible difference?
Yes definitely. I used two separate clocks in my CD63
Some clocks do have a flip flop frequency divider but I prefer using two separate clocks, a 8.xx MHz for the servo and a 16.xx Mhz for the DAC and decoder.
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Old 11th April 2013, 03:58 PM   #19239
dwjames is offline dwjames  England
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does anyone have any info on a simple divider circuit so a single upgraded clock can be shared with the servo please? I'll give that a go first.

Last edited by dwjames; 11th April 2013 at 04:01 PM.
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Old 11th April 2013, 04:46 PM   #19240
luke2fr is offline luke2fr  France
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answer is on page 231 & 232 I believe.
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