YSA-300B-XLS Reference 13.5W x2  SET Stereo Valve Tube Power Amplifier   Version 1.8

Audio Experience YSA-300B-XLS Reference V1.8 is a SE 13.5W x 2 Stereo Valve Tube Power Amplifier.
   The power amplifier use one EML 300B-XLS power tubes work at Class A Single Ended Triode no negative feedback configuration status to provide 13.5W 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-XLS tube work at Class A Single Ended Triode mode and fix bias to driver Hasimoto H-30-3.5U high quality output transformer , The Hasimoto H-30-3.5U 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. 




The Version 1.8 upgrade the power supply.

Review by HiFi review no:372 , p166~p168

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h30.jpg (300557 個位元組) Hasimoto H-30-3.5S CUT CORE orient high B Output Transformer 




Output and T.H.D :  
1W per channel , 1kHz total harmonic distortion typically 1% 
13.5W per channel , 1kHz total harmonic distortion typically 5%  (rated output)

Input :  RCA 

Input Impedance : 100K ohm

Frequency Response:

Test at 1W  20Hz ~ 80kHz  (20Hz -0.8dB, 20kHz -0.1dB, 80KHz -3dB)
Test at 13.5W  20Hz ~ 80kHz  (20Hz -1.3dB, 20kHz -0.1dB, 80KHz -3dB)

Input Sensitivity :  0.65V / 13.5W (rated output)     24.6dB gain ( 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 , EML300B-XLS x 2, 5U4Gx 1

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

Total Weight: 25kg

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


Actual Price: HK$29800.



The YSA-300B-XLS Reference with EML 5U4G-Mash rectifier tube version.
Actual Price: HK$32600.

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Room1308, 13/F,BLK C,.  
Kai Tak FTY BLDG.   
99-101 King Fuk ST,.   
San Po Kong,   KLN,.
Hong Kong
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