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 .

Features

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.

The power transformer is Hasimoto transformer , made in Japan.
The output transformer is Hasimoto HW-60-5 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 Amtrans Golden Black
The speaker and RCA connections is Cardas
The inside wire have uses Furutech and Sommer cable.

The info of Hasimoto HW-60-5 CUT CORE orient high B output transformer.

Specifications

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.

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