SONATAS-I MK2 Integrated Stereo Valve Tube Amplifier V1.5

Audio Experience SONATAS-I MK2 is a Integrated Stereo Valve Tube Power Amplifier.

The amplifier uses one matched pair of Mullard EL34 power tubes and UL working status to provide RMS 50W 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 12AX7 SRPP direct coupling to 12AU7 driver stage , The driver stage coupling use high quality capacitors to Mullard EL34 power tube , The EL34 work at P-P UL mode to driver high quality output transformer , The Hasimoto HWC-30-5 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 bias adjust of power tube is very easy , all bias test point and bias adjust at top of amplifier , you not need open the amplifier for adjust the power tube bias.

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

The V1.5 version have power amplifier mode with power input and power amplifier input / line preamp selector.

power input / line preamp selector and high/Low gain selector.

power amplifier input

The Hasimoto HWC-30-5 output transformer.

The power transformer is special audio R-core transformer , high current , low noise .

Specifications

Output and T.H.D :
1W per channel , 1kHz total harmonic distortion typically 0.15% (0.3% at 20Hz , 0.2% at 20KHz)
50W per channel , 1kHz total harmonic distortion typically 1.5% (rated output)

Controls : Volume, Input Selector , Power On/Of

Input : Preamp input (RCA) x 4 pair

Input Impedance : 100K ohm

Frequency Response:

Test at 1W 20Hz ~ 68kHz (20Hz -0.06dB, 20kHz -0.22dB, 68KHz -3dB)
Test at 50W 20Hz ~ 60kHz (20Hz -2.4dB, 20kHz -0.17dB, 60KHz -3dB)

Input Sensitivity :
Preamp input: 0.5V / 50W ( volume at Max ) Gain 32.5dB test at 8 ohm.
Power amplifier mode : Gain is 28 dB ( test at 8 ohm )

Output impedance : 4 ohm / 8 ohm ( 16 ohm with for order )

Noise: Less than 0.5mV

Damping factor : approximately over 16

Phase Mode : Normal

Tubes Required:
Power amplifier: EL34 Power Output x4 , 12AU7 Driver x2, 12AX7 Input x2.

Dimension: 445mm x 400mm x 180mm (W x D x H) each

Total Weight: 13kg

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

Actual Price: HK$13,900

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