YSA-2A3  4W+4W Integrated Stereo Valve Tube Amplifier

Audio Experience YSA2A3  is a 4W + 4W Integrated Stereo Valve Tube Power Amplifier.
   The power amplifier use one 2A3 power tubes work at SET Single Ended Triode configuration status to provide 4W adequate output . Moreover, It use the high quality output transformer ( Hasimoto . made in Japan).

   The line preamp stage use 6SJ7 tube , The driver stage use 6SN7 to driver 2A3 power tube . The 2A3 tube work at SET Single Ended Triode mode to driver Hasimoto HC-203U high quality output transformer , The Hasimoto HC-203U EI output transformer has very low Insertion Loss 0.6dB only.  ( Many SET tube power amplifier in Hi-End audio market , Their have the output transformers is over 2dB Insertion Loss . only about 10% very high price tube amplifier use under 1dB Insertion Loss of output transformer ) . The output transformer has low insertion loss is very important , the best of the best is 0 dB Insertion Loss , The output transformers for High End tube amplifier need under 1dB  Insertion Loss . The Insertion Loss over 1.5dB output transformer will lost many low level music. 

    This power amplifier case structure and parts arrangement are perfect, the signal path is directly and shortly connected. Great heat dissipation, an anti-shock and anti-RF function to guarantee it works at a very stable status. For sure, this machine is produced by point-to-point methodology. 



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Output and T.H.D :  
1W per channel , 1kHz total harmonic distortion typically 0.5% 
4W per channel , 1kHz total harmonic distortion typically 4%  (rated output)

Input :  4 pair RCA 

Controls : Volume, Input Selector , balanced , Power On/Of

Input Impedance : RCA is 100K ohm

Frequency Response:

Test at 1W  20Hz ~ 30kHz  (20Hz -0.25dB, 20kHz -1.6dB, 30KHz -3dB)
Test at 4W  20Hz ~ 30kHz  (20Hz -1.7dB, 20kHz -1.3dB, 30KHz -3dB)

Input Sensitivity :  volume at MAX ,  0.13V / 5W (rated output), 34dB gain (test at 8 ohm)

Output impedance : 4 ohm , 8ohm , 16ohm

Noise: Less than 1.5mV
Phase Mode : Normal

Construction: Copper and High quality aluminum

Tubes Required: 6SJ7WA x2 , 6SN7 x2 , 2A3 x 2,  5AR4 x 1

Dimension: 400mm x 300mm x 210mm (W x D x H)

Total Weight: 15kg

Power Source: 110-117/220 or 240V,50/60Hz

 Actual Price: HK$17,300


Room1308, 13/F,BLK C,.  
Kai Tak FTY BLDG.   
99-101 King Fuk ST,.   
San Po Kong,   KLN,.
Hong Kong
E-mail : info@ys-audio.com 
WhatsApp: 93440168   
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