ysa300b

YSA-300B-XLS Reference 13.5W x2 SET Stereo Valve Tube Power Amplifier Version 1.8

Audio Experience YSA-300B-XLS Reference V1.8 is a SE 13.5W x 2 Stereo Valve Tube Power Amplifier.

The power amplifier use one EML 300B-XLS power tubes work at Class A Single Ended Triode no negative feedback configuration status to provide 13.5W adequate output . Moreover, It use the high quality output transformer ( Hasimoto . made in Japan).

The input stage use 5687WA tube to driver 300B power tube . The 300B-XLS tube work at Class A Single Ended Triode mode and fix bias to driver Hasimoto H-30-3.5U high quality output transformer , The Hasimoto H-30-3.5U CUT CORE orient high B output transformer has very low Insertion Loss 0.3dB 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 methodology.

Features

Class A Single Ended Triode no negative feedback
The power transformer is Hasimoto transformer , made in Japan.
The output transformer is Hasimoto H-30-3.5S CUT CORE orient high B output transformer , made in Japan
The Choke is Hasimoto C-10-200W CUT CORE orient high B.
Fix Bias
Emission Labs 300B-XLS power tube.
All coupling cap use AudioCap Theta
The speaker connections is Star(Germany)
The inside wire have uses IN-AKUSTIK , Sommer cable and UniCrystal OCC (Ohno Continuous Cast) Copper wire.

BEST OF THE BEST 300B SET SOUND

The Version 1.8 upgrade the power supply.

Review by HiFi review no:372 , p166~p168

Hasimoto H-30-3.5S CUT CORE orient high B Output Transformer

EML 300B-XLS:
http://www.emissionlabs.com/datasheets/EML300B-XLS.htm

Specifications

Output and T.H.D :
1W per channel , 1kHz total harmonic distortion typically 1%
13.5W per channel , 1kHz total harmonic distortion typically 5% (rated output)

Input : RCA

Input Impedance : 100K ohm

Frequency Response:

Test at 1W 20Hz ~ 80kHz (20Hz -0.8dB, 20kHz -0.1dB, 80KHz -3dB)
Test at 13.5W 20Hz ~ 80kHz (20Hz -1.3dB, 20kHz -0.1dB, 80KHz -3dB)

Input Sensitivity : 0.65V / 13.5W (rated output) 24.6dB gain ( test at 8 ohm )

Output impedance : 4 ohm, 8ohm , 16ohm

Noise: Less than 1mV

Phase Mode : Normal

Construction: Copper and High quality aluminum

Tubes Required: 5687WA x2 , EML300B-XLS x 2, 5U4Gx 1

Dimension: 430mm x 340mm x 230mm (W x D x H)

Total Weight: 25kg

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

Actual Price: HK$29800.

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The YSA-300B-XLS Reference with EML 5U4G-Mash rectifier tube version.
Actual Price: HK$32600.

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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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