YSA-EL34 Reference  37W + 37W Stereo Valve Tube Power Amplifier

Audio Experience YSA-EL34 Reference is Stereo Valve Tube Power Amplifier.
It uses one matched pair of Mullard EL34 power tubes and UL working status to provide RMS 37W 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 .


   The input stage is E88CC SRPP direct coupling to ECC82 driver stage , The driver stage use high quality capacitors to EL34 power tube , The EL34 work at P-P UL mode to driver Hashimoto HW-40-5  high quality output transformer , Power supply with 2 GZ34(5AR4) rectifier tubes .The HW-40-5 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 components ,  NFB value , tube type , circuit all select by listen test.

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hw40.jpg (868987 個位元組)  hw40b.jpg (668165 個位元組) Hashimoto HW-40-5 CUT CORE orient high B output transformer.


Output and T.H.D :  
1W per channel , 1kHz total harmonic distortion typically 0.15% 
37W per channel , 1kHz total harmonic distortion typically 2%  (rated output)

Input : RCA 

Input Impedance : 100K ohm

Frequency Response:
Test at 1W  20Hz ~100kHz  (20Hz 0dB, 20kHz -0dB, 100KHz -0dB)
Test at 37W  20Hz ~ 52kHz  (20Hz -2.6dB, 20kHz -0dB, 52KHz -3dB)

Input Sensitivity :  0.73V / 37W (rated output)     27dB gain ( test at 8 ohm )

Output impedance : 4 ohm, 8 ohm , 16 ohm

Noise: Less than 0.8mV
Phase Mode : Normal

Construction: Copper and High quality aluminum

Tubes Required: E88CC x2 , ECC82 x 2, EL34x 4, GZ34(5AR4) x2

Dimension: 430mm x 340mm x 215mm (W x D x H)

Total Weight: 21.5kg

Power Source: 110-117/220-240V,50/60Hz (for order)


Actual Price: HK$23,880. 


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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