YSA150S-Reference 150W + 150W Stereo Valve Tube Power Amplifier

Audio Experience YSA150S-Reference is a 150W + 150W Stereo Valve Tube Power Amplifier.

It uses two matched pair of KT150 power tubes and UL working status to provide RMS 150W adequate output for most of the Hi-End Speakers to ideal performance. Moreover, It use the high quality output transformer ( Hasimoto . made in Japan).
Dual mono power supply design ( It is same one pair mono block build in at one chassis )
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 AudioCap Theta coupling capacitors to TUNG-SOL KT150 power tube , The power tube work at P-P UL mode to driver Hasimoto special grade CUT CORE orient high B" output transformer , The output transformer has very low Insertion Loss 0.13dB 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 and instrument test .

The power transformer is R-Core transformer.
The output transformer is Hasimoto special grade CUT CORE orient high B output transformer , made in Japan
Two Choke are Poshan (Kong Kong) Z11 EI Choke for each CH.
Dual mono power supply ( It is same one pair mono block build in at one chassis )
The input transformer for balanced input is Jensen
All coupling cap use AudioCap Theta
The speaker and RCA connections is Cardas
The inside wire have uses Furutech and Sommer cable.

Dual mono power supply ( this is equal one pair mono block build-in one chassis )

Hasimoto special grade CUT CORE orient high B output transformer.

Review by HiFi review.

Specifications

Controls
Power On/Of, Gain, Input RCA/XLR Selector

Output and T.H.D :
1W per channel , 1kHz total harmonic distortion typically 0.09% (0.15% at 20Hz , 0.2% at 20KHz)
150W per channel , 1kHz total harmonic distortion typically 1.5%

Input : RCA and XLR (balanced)

Input Impedance : 100K ohm is RCA , 10K ohm is XLR .

Frequency Response:

1W 20Hz ~ 100KHz ( 20Hz 0dB, 100KHZ 0dB)
150W 20Hz ~ 100kHz (20Hz -0.4dB , 100kHz -3dB)

Input Sensitivity : 1.6V / 150W ( gain control at max )

Output Taps: 16 ohm ,8 ohms, 4 ohms.

Noise: Less than 0.5mV

Damping factor : approximately over 23

Phase Mode : Normal

Tubes Required per channel: Two Matched pair KT150 Power Output , ( 1 ) 6H30 Driver , ( 1 )12AU7 Input .

Dimension: 433mm x 460mm x 233mm (W x D x H)

Total Weight: 32kg

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

Actual Price:

With XLR input ( Jensen input tran ) HK$38000.

Without XLR input (Jensen input tran) HK$37000.

YS-Audio
Room1308, 13/F,BLK C,.
Kai Tak FTY BLDG.
99-101 King Fuk ST,.
San Po Kong,   KLN,.
Hong Kong
Tel:(852)93440168
E-mail : info@ys-audio.com
WhatsApp: 93440168
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