YSA150S-Reference   150W + 150W Stereo Valve Tube Power Amplifier

Audio Experience YSA150S-Reference is a 150W + 150W Stereo Valve Tube Power Amplifier.
It uses two matched pair of KT150 power tubes and UL working status to provide RMS 150W adequate output for most of the Hi-End Speakers to ideal performance. Moreover, It use the high quality output transformer ( Hasimoto . made in Japan).
Dual mono power supply design ( It is same one pair mono block build in at one chassis )
Huge dynamic range, both the beautiful tone color and wonderful rhythm , ultra linear circuit of the valve tubs power amplifier designed for the SACD source in the New Century. uncanny natural flowing heart-stirring sound that matches any other ultra-Fi products on the market .


   The input/driver stage is new design, 12AU7 input stage direct coupling to 6H30 driver stage , The driver stage use AudioCap Theta coupling capacitors to TUNG-SOL KT150 power tube , The power tube work at P-P UL mode to driver Hasimoto special grade CUT CORE orient high B" output transformer , The output transformer has very low Insertion Loss 0.13dB only.  ( Many tube power amplifier in Hi-End audio market , Their have the output transformers is over 1dB 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.

The components ,  NFB value , tube type , circuit all select by listen and instrument test .




ysa150i2.jpg (646606 個位元組) ysa150i3.jpg (542145 個位元組)  Dual mono power supply ( this is equal one pair mono block build-in one chassis )

realxlout.jpg (707814 個位元組) Hasimoto special grade CUT CORE orient high B output transformer.

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ysa150d.jpg (491248 個位元組) ysa150g.jpg (490932 個位元組) ysa150f.jpg (659624 個位元組) ysa150e.jpg (634736 個位元組)

ysa150i1.jpg (510330 個位元組)

hfrw150s1.jpg (1914158 個位元組) hfrw150s2.jpg (1319816 個位元組) hfrw150s3.jpg (1444463 個位元組) Review by HiFi review.



Power On/Of, Gain, Input RCA/XLR Selector 

Output and T.H.D :  
1W per channel , 1kHz total harmonic distortion typically 0.09% (0.15% at 20Hz , 0.2% at 20KHz)
150W per channel , 1kHz total harmonic distortion typically 1.5%

Input :  RCA and XLR (balanced)

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

Frequency Response:  

1W    20Hz ~ 100KHz ( 20Hz 0dB, 100KHZ 0dB)
150W  20Hz ~ 100kHz (20Hz -0.4dB , 100kHz -3dB)

Input Sensitivity :  1.6V / 150W ( gain control at max )

Output Taps: 16 ohm ,8 ohms, 4 ohms.                                                      

Noise: Less than 0.5mV
Damping factor : approximately over 23

Phase Mode : Normal

Tubes Required per channel: Two  Matched pair KT150 Power Output , ( 1 ) 6H30 Driver , ( 1 )12AU7 Input .

Dimension: 433mm x 460mm x 233mm (W x D x H)

Total Weight: 32kg

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

Actual Price: 

With XLR input ( Jensen input tran ) HK$38000.

Without XLR input (Jensen input tran) HK$37000.


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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