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


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Product Features:

     SA-31 applies diamond differential circuit, working on + / - 35VDC high voltage power supply , thus have high linear characteristic and high dynamic . This circuit has always been  highly praised by users with its excellent performance and musical of whole  frequencies. Other circuits tend to lose details and clarity when they get the musical flavor, the SA-31, however, retains rich details and high clarity with its abundant music flavor with wide and deep sound stage . Diamond differential circuit has not only more profusion of whole frequency harmonic, but also an extremely clear sense of space and a correct delivery of speed.

      SA-31 without DC  servo circuit , thus it not only achieves the best performance on low frequency response and control power, but also has no sensible influence on the tone quality. But difficult to building.

      The output stage use of Cascode deforming circuit brings the merits of a good linearity and high-speed attribute.     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.    


Power supply:    
         A high performance transformer are used to supply power separately for the audio and control circuit.
    SA-31 uses 2 groups of high-quality and high output voltage class A parallel connection PSUs .
         The class A parallel connection PSU has very high input impedance to avoid pulse through the PSU from affecting the preamp and low output impedance with very fast speed and high linear, so it is a very clean power supply.
SA-31 applies another linear PSU for the display and control parts, avoid the disturbances through power line from affecting the amplifier.
          Class A  power supply.

Volume control:
SA-31 with remote control, the volume control applied resistors components, can avoid channel imbalance and improve on sound quality than normal potentiometer.
        The volume control is also different from conventional technology. Conventional volume control technology is the volume control implement in the analog amp input stage through a volume pot to reduce the signal  . The volume pots quality effect the sound quality direct , the low quality volume pot cause lost the detail and channels imbalance cause the soundstage distortion  . Even the high performance volume pot still cause the detail lose. Whatever quality volume pots, must cause the S/N worst .
    In SA-31, the volume applied parallel connection control technology, the audio signal had not through the volume pot feed to the amp . So its quality have not effect by the volume pot quality .
         SA-31 applied two channels digital control relays based volume control. The volume board  through changing the DALE resistors to control the volume for avoid channels imbalanced ,achieve the best performance and sound quality of the gear.
        SA-31 have 100 steps volume level control in both high gain  and low gain mode. The total 200-step volume control ensures smooth control of the volume level.





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