SONATAS-IS Integrated Stereo Valve Tube Amplifier V1.5

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

The amplifier uses one matched pair of EH KT88 (KT120,KT150,KT170) power tubes and UL working status to provide RMS 60W 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 AudioCap capacitors to EH KT88 power tube , The KT88 work at P-P UL mode to driver high quality output transformer , The Hashimoto HW-60-5 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 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 amplifier with remote for volume controls

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

power input / line preamp selector.

power amplifier input

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

Hashimoto HW-60-5 CUT CORE orient high B output transformer.

All coupling cap use Auricap XO.

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

with L5 balanced input.

Review of SONATAS-IS Integrated Amplifier by HiFi review #452

Specifications

Output and T.H.D :
1W per channel , 1kHz total harmonic distortion typically 0.23% (0.3% at 20Hz , 0.2% at 20KHz)
60W per channel , 1kHz total harmonic distortion typically 1.5% (rated output)

Controls : Volume , Input Selector ,power input / line preamp selector, High / Low Gain selector , Power On/Of
Remote control: Volume

Input : Preamp input (RCA) x 4 pair , Power amplifier (RCA) 1 pair

Input Impedance : Preamp 100K ohm , Power Amplifier 100K ohm

Frequency Response:

Test at 1W 20Hz ~ 45kHz (20Hz 0dB, 20kHz -0.7dB, 45KHz -3dB)
Test at 60W 20Hz ~ 45kHz (20Hz -0.5dB, 20kHz -0.9dB, 45KHz -3dB)

Input Sensitivity :
Integrated amplifier mode : High Gain is 34.5dB , Low Gain is 31 dB ( test at 8 ohm )
Power amplifier mode : High Gain is 31dB , Low 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 18

Phase Mode : Normal

Tubes Required:
Integrated amplifier model : KT88(KT120,KT150) Power Output x4 , 12AU7 Driver x2, 12AX7 Input x2
Power amplifier model : KT88(KT120,KT150) Power Output x4 , 12AU7 Driver x2, 12AT7 Input x2.

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

Total Weight: 15kg

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

Actual Price:

Without L5 balanced input : HK$20,000
With L5 balanced input (input transformer) : HK$22,500

The power tubes from EH KT88 upgrade to use Tung-Sol KT150 add extra cost $1800.
The power tubes from EH KT88 upgrade to use Tung-Sol KT170 add extra cost $2800.

YS-Audio
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Hong Kong
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