SONATAS - Reference MK2  Stereo Valve Tube Power Amplifier

Audio Experience SONATAS-Reference MK2 is a 82W + 82W Stereo Valve Tube Power Amplifier.
It uses one matched pair of KT88 or KT120 or KT150 power tubes and UL working status to provide RMS 82W 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 Gold Lion KT88 or TUNG-SOL KT120 or TUNG-SOL KT150 power tube , The power tube work at P-P UL mode to driver Hasimoto HW-60-5 CUT CORE orient high B" output transformer , The HW-60-5 output transformer has very low Insertion Loss 0.21dB 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 Sonatas-Reference have RCA and Balanced two version, the price is same.

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



sfmk2h.jpg (406900 個位元組) sfmk2a.jpg (424313 個位元組) sfmk2d.jpg (413648 個位元組)  sfmk2c.jpg (397613 個位元組) sfmk2j.jpg (354149 個位元組) sfmk2e.jpg (360935 個位元組) 

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 sfmk2i2.jpg (430541 個位元組) sfmk2i3.jpg (364239 個位元組) sfmk2i1.jpg (300302 個位元組)  

hw40b.jpg (668165 個位元組) The info of Hasimoto HW-60-5 CUT CORE orient high B output transformer.



Output and T.H.D :  
1W per channel , 1kHz total harmonic distortion typically 0.04% (0.07% at 20Hz , 0.065% at 20KHz)
43W per channel , 1kHz total harmonic distortion typically 0.4% (1.5% at 20Hz , 0.9% at 20kHz)
82W per channel , 1kHz total harmonic distortion typically 1%

Input :  RCA and XLR (balanced)

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

Frequency Response:  

1W    20Hz ~ 75KHz ( 20Hz 0dB, 75KHZ -1dB)
82W  20Hz ~ 75kHz (20Hz -1dB , 75kHz -3dB)

Input Sensitivity :  1.25V / 82W      25.5dB gain ( test at 8 ohm )

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

Noise: Less than 1mV
Damping factor : approximately over 20

Phase Mode : Normal

Tubes Required per channel: One Matched pair KT88/KT120/KT150 Power Output , ( 1 ) 6H30 Driver , ( 1 )12AU7 Input .

Dimension: 455mm x 350mm x 250mm (W x D x H)

Total Weight: 24kg

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

Actual Price: 

With XLR input ( Jensen input tran ) HK$28500.

Without XLR input (Jensen input tran) HK$27000.

The output tubes upgrade to use KT150 add extra cost $1000.

The output transformer from HW-60-5 upgrade to use HW-100-5  add extra cost $2000.


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