YSA-300MB  Mono Block Valve Tube Power Amplifier

Audio Experience YSA-300MB  is a 7W Valve Tube Power Amplifier.


 The power amplifier use one 300B power tubes work at SET Single Ended Triode configuration status to provide 7W adequate output . Moreover, It use the high quality output transformer ( TANGO . made in Japan).

   The input stage use one 5687WB input/ Driver tubes . 5687WB driver tube use Sonicap coupling capacitor to 300B power tube . The 300B tube work at SET Single Ended Triode mode to driver TANGO U-808 high quality output transformer , The TANGO U808 output transformer has very low Insertion Loss 0.5dB only.  ( Many SET tube power amplifier in Hi-End audio market , Their have the output transformers is over 2dB 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. 

    This power amplifier case structure and parts arrangement are perfect, the signal path is directly and shortly connected. Great heat dissipation, an anti-shock and anti-RF function to guarantee it works at a very stable status. For sure, this machine is produced by point-to-point.


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Output :  7W (8 ohm)  each block

Input :  RCA with level control

Input Impedance :  100K ohm

Frequency Response at 7W :  20Hz ~ 25K Hz ( +0/-0.5dB )   

Input Sensitivity :  1.4V / 7W

Output impedance : 4 ohm / 8 ohm                                          

S/N Ratio: > 103dB (IHF-A Average rate),   >86dB (Flat Average rate)

Phase Mode : Normal

Construction: Copper Plated Chrome and High quality aluminum

Tubes Required: 5687WB x1 , 300B x 1, 5U4G x 1 … each block.

Dimension: 400mm x 340mm x 170mm (W x D x H) … each block.

Total Weight: 10kg each block.

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


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