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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 .
     


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Превосходный DAC для Rock музыки завораживающее звучание. Новинка Сентябрь 2013!

Dedicated Discrete Diamond Difference design  DAC
NOS design applied up to 96K support
4pcs PCM1704UK (two-two parallel)


 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.
         Some years ago we have build different NOS DACs , 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 black background  .
         While you decide place the order please ensure the NOS DAC  characteristics.

 
 
75000.00 руб.

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 .

 
 
65000.00 руб.

Fully  discrete Diamond Difference design , without any OPA and couple caps in the signal channels. 
High working voltage (+/-35VDC) class A design .

Uses 3 units R-core transformer .

Sound characteristic : Musical (coloration ) but detail , smooth but not too warm .

 
 
90000.00 руб.

Fully balanced design, the gain stages and pre-driver stages working on full class A , built by discrete analog stages without any OPA and couple caps in the signal channels. 
The output transistors stages working on high idle current state . The Diamond Cross output stage design can avoid "switch distortion" as good as the class A amp .
Diamond Difference design , detail but a bit smooth 

85000.00 руб.

Discrete Preamp / Headphone amp
Applied Diamond Difference design
Power output 10,000 mW @ 40 ohm

 
 
30000.00 руб.
(пусто)
 
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