SONATAS - Reference 300B  Stereo Valve Tube Power Amplifier  Version 1.5

Audio Experience SONATAS - Reference 300B  is Stereo Valve Tube Power Amplifier.
It uses one matched pair of Electro-Harmonix 300B power tubes and PP Class A working status to provide RMS 19W 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 DVD - Audio and SACD source in the New Century. uncanny natural flowing heart-stirring sound that matches any other ultra-Fi products on the market .


   The input stage is 12AU7 direct coupling to 5687WA driver stage , The driver stage use high quality capacitors to 300B power tube , The 300B work at P-P Class A mode to driver Hasimoto HW-40-5  high quality output transformer , The HW-40-5 CUT CORE orient high B output transformer has very low Insertion Loss 0.2dB 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.

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sr300h.jpg (400373 個位元組)   sr300g.jpg (416596 個位元組) sr300j.jpg (412746 個位元組) 

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hw40.jpg (868987 個位元組)  hw40b.jpg (668165 個位元組) The info of Hasimoto HW-40-5 CUT CORE orient high B output transformer.


Output :  
1W per channel , 1kHz total harmonic distortion typically 0.2%(0.3% at 20Hz , 0.15% at 20KHz)
19W per channel , 1kHz total harmonic distortion typically 2%

Input :  RCA and XLR (balanced)

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

Frequency Response:  

1W    20Hz ~ 86KHz ( 20Hz 0dB, 86KHZ -3dB)
19W  20Hz ~ 60kHz (20Hz -0.5dB , 60kHz -3dB)

Input Sensitivity :  0.75V / 19W

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

Noise: Less than 1mV
Damping factor : approximately over 10

Phase Mode : Normal

Tubes Required: One Matched pair 300B Power Output , ( 1 ) 5687WA Driver , ( 1 )12AU7 Input .

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

Total Weight: 21kg

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

 Actual Price: HK$28500


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