SONATAS-IS Integrated Stereo Valve Tube Amplifier V1.5
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 AudioCap.
The power transformer is special audio R-core transformer , high current , low noise .
with L5 balanced input.
Output and T.H.D :
Controls : Volume , Input Selector ,power
input / line preamp selector, High / Low Gain selector , Power
|Input : Preamp input (RCA) x 4 pair , Power amplifier (RCA) 1 pair|
Input Impedance : Preamp 100K ohm , Power Amplifier 100K ohm
Test at 1W 20Hz ~ 45kHz
(20Hz 0dB, 20kHz -0.7dB, 45KHz -3dB)
Input Sensitivity :
Output impedance : 4 ohm / 8 ohm ( 16 ohm with for order )
|Noise: Less than 0.5mV|
|Damping factor : approximately over 18|
Phase Mode : Normal
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
Without L5 balanced input :
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.
Room1308, 13/F,BLK C,.
Kai Tak FTY BLDG.
99-101 King Fuk ST,.
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