YSA100S-Reference  Mono Block Power Amplifier

Audio Experience YSA100S-Reference is a Mono Block Power Amplifier 
It uses one matched pair of KT150 power tubes and UL working staus to provide RMS 95W adequate output for most of the Hi-End Speakers to ideal performance. Moreover, It use the high quality output transformer ( Hasimoto . made in Japan).
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 Amtrans Golden Black coupling capacitors to TUNG-SOL KT150 power tube , The power tube work at P-P UL mode to driver Hasimoto HW-100-5 CUT CORE orient high B" output transformer , The HW-100-5 output transformer has very low Insertion Loss 0.15dB 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 test.

HiFi review Best Buy of the year-2014


r100p3.jpg (249674 個位元組)  Amtrans Golden Black coupling cap.

r100p2.jpg (220968 個位元組)  R-Core power transformer. 

r100p1.jpg (364674 個位元組)  Hasimoto output transformer , Hasimoto  choke , Jensen input transformer

hw1005.jpg (364115 個位元組)  hw1005b.jpg (258700 個位元組) The info of Hasimoto HW-100-5 CUT CORE orient high B output transformer.

r100a.jpg (338751 個位元組) r100b.jpg (295724 個位元組) r100c.jpg (370072 個位元組) r100d.jpg (304470 個位元組) r100e.jpg (383935 個位元組) 
r100f.jpg (434152 個位元組)
r100g.jpg (383643 個位元組) r100h.jpg (321925 個位元組) r100k.jpg (398319 個位元組)
r100is1.jpg (319421 個位元組) r100is3.jpg (270104 個位元組) r100is4.jpg (262030 個位元組) 
r100is2.jpg (301302 個位元組) r100i.jpg (279644 個位元組)



Output and T.H.D :  
1W per channel , 1kHz total harmonic distortion typically 0.08% (0.1% at 20Hz , 0.08% at 20KHz)
95W 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 -0.05dB)
95W  20Hz ~ 100kHz (20Hz -0.1dB , 100kHz -2dB)

Input Sensitivity :  1.3V / 95W   25.5dB Gain ( Test at 8 ohm )

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

Noise: Less than 0.5mV
Damping factor : approximately over 22

Phase Mode : Normal

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

Dimension: 300mm x 438mm x 233mm (W x D x H) each

Total Weight two block: 33kg

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

Actual Price: 

With XLR input ( Jensen input tran ) HK$29500.

Without XLR input (Jensen input tran) HK$28500.

HiFi review Best Buy of the year-2014


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   
facebook :