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tomat 14th May 2009 12:19 PM

clock question?
 
maybe someone can help?, i'm plan to upgrade the clock from my very old nakamichi Dac ,the clock frequency is 18Mhz i think ,as labeled on it's original clock ,but i can't find the high grade clock such tentlabs ,trichord ,etc with the same frequency.
my question ,can i replace the original 18Mhz clock ,with other clock with frequency say 18,..... Mhz

thanks

QSerraTico_Tico 15th May 2009 09:34 AM

16.9344MHz would be more likely for the Nakamichi. What is the model of your Nak?
This one?:
http://cgi.ebay.com/Service-Manual-N...28131009r12545

tomat 16th May 2009 12:38 AM

thanks Mr Quirck ,my naka is old dragon Dac

tomat 16th May 2009 12:45 AM

this old naka dragon dac actually sound good enough ,but i feel
the transparancy is not too good ,high frequency is a bit dull.
i want to improve this .any suggest what should i do?

thanks

tomat 16th May 2009 01:28 AM

this dac using dac ic burrbrown pcm 1704 & ne5534 as i/v.

thanks

Thomo 16th May 2009 08:34 AM

You could try changing the ne5532 opamps for LM4562 by National Semi. These are many people's favourite and will sound far more detailed and transparent than the original parts.

Changing the caps decoupling the opamps will help a lot too.

Cheers, Lee.

Fidelity Audio 16th May 2009 12:03 PM

What Lee said + I think that dac runs 24.576Mhz.
There should be 2 crystals on the pcb one of which is for the cpu which will be the 18Mhz. Unless you misread the crystal and it was 16.934Mhz.

Brent

tomat 17th May 2009 05:40 AM

Quote:

Originally posted by Thomo
You could try changing the ne5532 opamps for LM4562 by National Semi. These are many people's favourite and will sound far more detailed and transparent than the original parts.

Changing the caps decoupling the opamps will help a lot too.

Cheers, Lee.


thanks Mr Lee ,i try that :)

tomat 17th May 2009 05:51 AM

Quote:

Originally posted by rowemeister
What Lee said + I think that dac runs 24.576Mhz.
There should be 2 crystals on the pcb one of which is for the cpu which will be the 18Mhz. Unless you misread the crystal and it was 16.934Mhz.

Brent


thanks Mr Brent ,i'm little confuse with this ,the mark on crystal is
18.0M-2MT ,what does it mean?

cheers

Fidelity Audio 28th October 2009 07:24 PM

That is a 18Mhz crystal and is not for the dac

Brent


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