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 .

Features

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.

The power transformer is Hasimoto transformer , made in Japan.
The output transformer is Hasimoto HW-40-5 CUT CORE orient high B output transformer , made in Japan
The Choke is Hasimoto
The input transformer for balanced input is Jensen
All coupling cap use Sonicap
The speaker connections is Cardas
The inside wire have uses Furutech and Sommer cable
The power caps is F&T (made in Germany )

The info of Hasimoto HW-40-5 CUT CORE orient high B output transformer.

Specifications

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

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