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NOS-1704 (Limit)
Dedicated Discrete Diamond Difference design  DAC
NOS design applied up to
192K support
4pcs PCM1704UK (two-two parallel connect)

Price:  USD859   (Exclude shipping cost)
(Default install DIR9001 for SPDIF input support up to 24bit / 96KHz, if customer want support up to 192KHz, while place the order inform free replace by CS8416 .)


24Bit 192KHz USB-SPDIF convertor price USD40 .
The USB-SPDIF convertor place on outside, connect to computer, SPDIF connect to NOS-1704 input for implement USB playback.
Driver download:

Download TE8802 driver V2.0   (For Windows)
Download TE8802 driver V1.1 for mac
Summarize Use Manual Specs Technology Detail Custom Option Shipping Cost

          It is close the PCM1704UK chips out of stock, so we design the NOS-1704 as the final version musical DAC built in PCM1704UK .
         The NOS-1704 had applied the NOS + Diamond Difference combo design which is had consider the best musical designs.            
         NOS mean Non OverSample technology, It is easy to implement  but difficult to achieve the good state , without the oversampling digital filter cause the  DAC difficult to  reproduce  a dark background .  Some designs  cut a lot high frequency signal in analog parts to reduce the noise, but lost the detail and have unacceptable phase distortion .
         15 years ago we start build NOS DACs, we have build some lot different NOS DACs , the popular design with TDA1541, TDA1543 sound too warm but lost detail .
         The NOS-1704 sound not very warm but  smooth , have not lose detail and reduce dynamic, the most important is it still have dark background  .
         While you decide place the order please ensure you know  the NOS  DAC  characteristics.

Fully  discrete Diamond Difference design , without any OPA and couple caps in the signal channels. High working voltage (+/-35VDC) class A design .
Uses  R-core transformer .
More than 20,000uf audio grade NOVER capacitors are used to ensure ample and smooth power feed.
A total of 4 groups class A PSU and 4 groups linear PSU  are used to purify the power supply. To achieve high S/N, the control circuit is powered with separate regulator.
Uses most Hi-end grade parts and exact match transistors.
High / Low output level select .

5 groups digital input :
  coaxial *2 / Optical *2 / BNC*1
DAC output :

History of the Diamond Difference design :

         At July 2004, I registered the brand audio-gd ,  at September 2004, I published the first generation diamond difference design at the < Radio & TV> , the best popular  audio technology magazine in China . There were a lot DIYer call me even writed letters to me discuss the circuit.          At November 2004 , the fist regular product of audio-gd , XA-100 power amp released. It had the good honor from customers , let audio-gd can stand and grow up. Before this amp, I already have 6 years experiences of built the Diamond Difference circuit .         At 2005,  the first regular DAC product  DAC-1 released,  a   TDA1541A with diamond difference output stages.
       At 2006 ,the RT-1 released ,  its sound adjusted based on a 300B tube amp.      At 2007 , the RT3 kit released for DIYers .         At 2008 , the DAC-3 released, built in 4 pcs PCM1704 with diamond difference design .
At 2009 ,the SA-300 balanced amp released .     At 2010, I design the dual TDA1541AS2 DAC for fun, we only sale 5 units to the return customers . A pair TDA1541AS2 now value USD800 in market . At 2011 is the Reference 8 and 9 released .

Some other products applied Diamond Difference design maybe can't list , like the C-2 SA, ROC-SA, SA-100.


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