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.
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 may get two of these:
http://www.audiocominternational.com/product_detail.asp?id=27#
Dac & Servo, what do you think guys? lol.
Lee.
http://www.audiocominternational.com/product_detail.asp?id=27#
Dac & Servo, what do you think guys? lol.
Lee.
Andre Visser said:
Hi All
After carefully following Ray´s detailed information about the CD 53, mixed with some ideas comming from Mr. Stein, and latter with the special information from Brent and Simon, I finally understand the schematics of the CD53 and the best ways to improve its performance.
I focused myself in the Digital PSU and the digital output because I found that the sound processed by an external dac (SONY DTC 670) is much more detailed.
I am now interested in the analog stage of the CD53 and would like to know if the effort will produce a better result than using the tape recorder as a dac.
Can the DAC (QD01 SM5872BS) be tuned to work as well as the Sony ?
I read about the LM4562NA opamp but can not find it in Farnell.... can anyone help ?
Best Regards
Ricardo
National (http://www.national.com) have a sample programme that lets you order up to 5 chips for free (or for the price of postage).
Simon
Simon
RCruz said:
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
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.
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.
Thomo said:
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!
RCruz said:
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
RCruz said:
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.
Thomo said:
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
