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Old 14th October 2007, 09:17 PM   #7991
Thomo is offline Thomo  United Kingdom
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I agree with the things Simon says about the lm6172's. I find them sterile at times, but the detail level makes up for the downsides.

Simon, for your external psu, do you rectify the ac in the psu or the cd player? If external, how much capacitance is it best to use for the (relatively) long connecting cable?

Cheers,

Lee.
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Old 14th October 2007, 09:43 PM   #7992
RCruz is offline RCruz  Switzerland
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Quote:
Originally posted by SimontY

Extra detail comes from reclocking the servo more than any other single change you can do, so try that. And this will help even if you continue to use the external DAC (which I doubt you will eventually).
Hi Simon

Thanks for the advice... I will try the servo reclocking.... can you suggest a simple low cost way ?

Regards

Ricardo
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Old 14th October 2007, 09:51 PM   #7993
SimontY is offline SimontY  United Kingdom
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Quote:
Originally posted by Thomo
Simon, for your external psu, do you rectify the ac in the psu or the cd player? If external, how much capacitance is it best to use for the (relatively) long connecting cable?
Hi Lee,

I rectify the AC in the PSU. I've not experimented with different amounts of smoothing, but the "more the merrier" approach seems sensible for this (any radiated noise is confined to the psu).

If you try this external idea be careful: listen (with it turned up loud) every time you swap a psu to external for added noise. I have a slight noise problem I could do with dealing with now and I'm not sure why!


Quote:
Originally posted by RCruz
Thanks for the advice... I will try the servo reclocking.... can you suggest a simple low cost way ?
Ricardo,

It's my pleasure. I can't suggest a cheap way but the "Kwak Clock" is probably the cheapest and is fully DIY. It might not work out as the "best" solution though.

Simon
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Old 14th October 2007, 09:58 PM   #7994
RCruz is offline RCruz  Switzerland
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Quote:
Originally posted by SimontY


Hi Ricardo,

I think the best advice I can give is to say that the LM4562 sounds most like the discrete output stage of any op-amp I've tried (Brent agrees with this). So with this in mind try the 4562 (or its successor, whose model no. escapes me) and if you like it (but find it sterile at times) you will love Ray's discrete stage.

The improved output stage, which bypasses the HDAM (if CD63/7) and everything else after the DAC, makes a huge improvement to the musicality of the player.

Extra detail comes from reclocking the servo more than any other single change you can do, so try that. And this will help even if you continue to use the external DAC (which I doubt you will eventually).

Simon

Quote:
Originally posted by SimontY



It's my pleasure. I can't suggest a cheap way but the "Kwak Clock" is probably the cheapest and is fully DIY. It might not work out as the "best" solution though.


Hi Simon

Where can I find these LM4562 ? Farnell does not have them..

What should be the optimum solution for the servo clock ?

I am not very experienced with the iron...


Regards

Ricardo
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Old 14th October 2007, 10:30 PM   #7995
Thomo is offline Thomo  United Kingdom
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Quote:
Originally posted by RCruz

Hi Simon

Where can I find these LM4562 ? Farnell does not have them..

What should be the optimum solution for the servo clock ?

I am not very experienced with the iron...


Regards

Ricardo

Hi Ricardo,

Try here

As far as I can tell, they're not a bad company to use

Thanks for the info Simon. As it is I've got a left channel hum now. Only when the player is switched on, but not changed by swapping the left/right interconnect!

Lee.
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Old 15th October 2007, 03:27 AM   #7996
navin is offline navin  India
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Quote:
Originally posted by Andre Visser


I’ve discovered this thread a few weeks ago while searching for mods on my Marantz 63KI, it took a LOT of reading to get through all the posts but I can say it was worth every minute.

I’ve built my own 200W ClassA Monoblock amplifiers, almost finished with a set of 2.5way transmission line loudspeakers with Seas Excel drivers and my pre-amp should be “finished” in a month, so I think it is time to get working on the CD player.
200 W class A? that must produce a lot of heat as well. can you share the details of your system (2.5 way loudspeaker, preamp etc..)?
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Old 15th October 2007, 07:23 AM   #7997
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Quote:
Originally posted by Thomo
I finished my mates cd67 the last weekend and he is very, very happy with it. It included a Superclock4 for which I built a power-supply. I am completely surprised by how much better the Superclock4 is compared with my Superclock2.

Over all there wasn't as much detail with his player compared to mine as it has fewer mods, but what was there was so cleanly separated and free from sibilance that I would trade them any day. Mine sounds congested next to the other. Does anyone know the differences between the two clocks? As far as I can tell the SC4 has better power supply filtering, but aside from that I don't know.

Can my superclock2 be improved or modded?

Lee.
I really think the main difference here is the 67 servo is fed its clock through the dac from the SC4. Unless you have clocked your servo now. I run SC3 on dac and SC2 on servo. Changing from SC2 to SC3 on dac gave very very small gains but adding the SC2 onto the servo gave large gains, fine detail and instruments became much clearer and realistic.

So if you have not fitted your SC2 to the servo do it then compare to the 67.

Also the price of a SC4 or the new one is quite expensive and I believe and know that this kind of money is better spent on low noise regs (providing you already have a decent clock)

Brent
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Old 15th October 2007, 08:11 AM   #7998
Thomo is offline Thomo  United Kingdom
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Thanks for that Brent. I should have said that both players are cd67's, I had to sell the KI when I was made redundant due to lack of funds

I've just remembered though that my mates cd67 was fitted with 1% silver mica caps in the filter, mine has 1% polystyrene. That maybe it.

Lee.
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Old 15th October 2007, 08:17 AM   #7999
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Oh

I wouldn't have thought the caps would be that different. Perhaps the SC4 is that good.

Brent
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Old 15th October 2007, 08:37 AM   #8000
Thomo is offline Thomo  United Kingdom
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I hope not!

Reading Audiocom's spiel about the sc4, they say it has separate on-board low noise regs for dig and analogue.

Does anyone know if there's any way to split these on the sc2 and feed them with off-board regs?
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