YSA-300B Plus MK2  8.5W x2 Stereo Valve Tube Power Amplifier


Audio Experience YSA-300B Plus MK2  is a 8.5W x 2 Stereo Valve Tube Power Amplifier.
   The power amplifier use one 300B power tubes work at Class A Single Ended Triode no negative feedback configuration status to provide 8.5W adequate output . Moreover, It use the high quality output transformer ( Hasimoto . made in Japan).

   The input stage use 5687WA tube to driver  300B power tube . The 300B tube work at Class A Single Ended Triode mode to driver Hasimoto H-20-3.5U high quality output transformer , The Hasimoto H-20-3.5U CUT CORE orient high B output transformer has very low Insertion Loss 0.3dB 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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h20.jpg (144084 個位元組) Hasimoto H-20-3.5U Output Transformer



Output and T.H.D :  
1W per channel , 1kHz total harmonic distortion typically 0.7% 
8.5W per channel , 1kHz total harmonic distortion typically 5%  (rated output)

Input :  RCA and XLR

Input Impedance : RCA is 100K ohm , XLR is 10K ohm 

Frequency Response:

Test at 1W  20Hz ~ 80kHz  (20Hz -0.07dB, 20kHz -0.3dB, 80KHz -3dB)
Test at 8.5W  20Hz ~ 80kHz  (20Hz -1.8dB, 20kHz -0.3dB, 80KHz -3dB)

Input Sensitivity :  0.45V / 8.5W (rated output)   26dB Test at 8 ohm

Output impedance : 4 ohm 8ohm , 16ohm

Noise: Less than 1mV
Phase Mode : Normal

Construction: Copper and High quality aluminum

Tubes Required: 5687WA x2 , 300B x 2, 5U4G x 1

Dimension: 430mm x 340mm x 230mm (W x D x H)

Total Weight: 20kg

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

Actual Price: 
With XLR input HK$20180.
Without XLR input HK$18980.



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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