YSA100S-MK2.8  Mono Block Power Amplifier

Audio Experience YSA100S-MK2.8 Mono Block Power Amplifier is a Full balanced design power amplifier. It provides sound deep and wide stage, accompanies with reality sound image and a emotions sound presentation.
It uses one matched pair of KT150 power tubes and UL working status to provide 90W adequate output for most of the Hi-End Speakers to ideal performance. Moreover, the high quality output transformer combines with high performance full balanced circuit design lead to an extremely low loss, wide sequence sound effect and excellent phases output. 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 full balanced input stage is 12AT7  direct coupling to 12AU7 full balanced driver stage , The driver stage use high quality capacitors to KT150 power tube , The KT150 work at P-P mode to driver Hasimoto output transformer , The Hasimoto 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.

100s150a.jpg (474519 個位元組) 100s150c.jpg (391750 個位元組) 100s150d.jpg (256819 個位元組)

The YSA100S-MK2.8 use high quality transformers .

hw1005.jpg (364115 個位元組)  hw1005b.jpg (258700 個位元組)


Output and T.H.D :  
1W per channel , 1kHz total harmonic distortion typically 0.05% (0.08% at 20Hz , 0.1% at 20KHz)
90W per channel , 1kHz total harmonic distortion typically 1.7% (rated output)
100W per channel , 1kHz total harmonic distortion typically 2.5%
150W per channel , Max.

Input :  Balanced ( XLR ) x 1

Input Impedance :  200K ohm

Frequency Response:  

1W    20Hz ~ 100KHz ( 20Hz 0dB, 100KHz -2dB)
90W  20Hz ~ 100kHz (20Hz -0.12dB , 100kHz -3dB)

S/N: >100dB

Input Sensitivity: 1V RMS rated output.
Output Taps: 4 ohm , 8 ohm , 16 ohm.
Damping factor : approximately 20
Tubes Required for each black: ( 2 ) Matched pair KT150 Power Output , ( 1 ) 12AU7 Driver , ( 1 )12AT7 Input .

Phase Mode : Normal

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

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



Actual Price: HK$28000.


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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