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Nobsound Pure Class A Single-ended Tube Headphone Amplifier Stereo HiFi Preamp

This is Hi-End pure class A tube headphone amplifier, also can be used as Preamp. With 4-gear to select output impedance, suitable for a wide range 15-600Ω headphones, especially for  K701 HD650 etc.
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This is Hi-End pure class A tube headphone amplifier, also be used as Preamp. With 4-gear to select output impedance, suitable for a wide range 15-600Ω headphones, especially for  K701 HD650 etc. Also different from the general pure tube headphone amp which drive current isless than 100MA, it's hard to drive the 64Ω below headphones, this tube amp use the costliest Japan Z11 audio output transformer, achieve optimum impedance matching, even 16Ω headsetis completely no pressure. really makes a huge deal on the quality of sound.

Choose different gear according to the impedance of the headphones, For example:
50Ω gear suit for 16-50Ω headphones. 
150Ω gear suit for 50-150Ω headphones.  
Architecture: single-ended Class A with output transformer design
Use tubes: TUNG-SOL 6SN7X2 / Czech JJ ECC83
Impedance range: 16-600Ω
Frequency response: 15 - 100,000 hz
Distortion: 0,002%
Dimensions: Width 268 height 147 depth 251mm
Weight: 6kg (with packaging)
Potentiometer: Japan ALPS volume potentiometer
Chassis: Hi-END Aluminium CNC chassis, very charming. 
Output: Neutrik 6.35mm headphone jack / Preamp RCA output
Input: 2 RCA analog inputs 
Output Power: 32Ω 1200MW / 250Ω 450MW
  • 1PC tube amp
  • 1PC power cord
When I use this Nobsound NS-06E compared with the USA woo audio wa22 headphone amp, actually the sense of hearing almost the same outstanding, while our NS-06E is much cheaper.
Almost suit any headphone, and I need special proposed is the output transformer, use the latest and most complex processes, most of the factory cannot do it.
Below is the Hard part of drawings:

schematic diagram:

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