睿志音响

	Wisdom in mind, enthusiasm at heart.

SA-31

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

Price: SA-31 (applied Neutrik RCA scokets): USD499
Remote control : +USD50

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Feeback: http://www.head-fi.org/t/617667/audio-gd-sa-31-head-amp-preamp-a-powerfull-head-amp-with-diamond-difference-design/15 Fully discrete Diamond Difference design , without any OPA and couple caps in the signal channels. High working voltage (+/-35VDC) class A design . R-core transformers. More than 25,000uf audio grade NOVER capacitors are used to ensure ample and smooth power feed. For larger power drive, the output stage applied two pair 15A / 150W Toshiba transistors , power output 10,000mW @ 40 ohm, no matter for most headphone in world. 2 group class A dedicated PSUs are used to purify the power supply, the amp working at high idle class A model . Digitally controlled relay-based volume control to avoid channel imbalance and improve sound quality. SA-31 has 80 steps volume level control in both high gain mode and low gain mode. The total 160 step volume control ensures smooth control of the volume level. 5 Channel RCA inputs Preamp output : RCA * 3 Headphone output : 4 pins XLR / 6.3MM SE (10W @ 40 ohm) (The XLR still single-ended output, just for who have balanced plugs headphone but use with the SA-31 ) Memorizes all settings and it could resume the last settings when power on. Applied high end grade parts , the Neutrik XLR sockets, 6.3 " headphone scoket and RCA sockets. The SA-31 remote control common with other audio-gd DAC remote control, if customer already own the DAC (NFB-10SE, NFB-9 ) remote control and want the especial remote control for SA-31, please inform us while place the order. Sound Characteristics:* We describing its retains rich details and high clarity with its abundant music flavor with wide and deep sound stage . 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 （Replace Tube) 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.