YSA300b Reference MK2

YSA300B Reference MK2 9W x2 SET Stereo Valve Tube Power Amplifier

Audio Experience YSA300B Reference MK2 is a SE 9W x 2 Stereo Valve Tube Power Amplifier.

The power amplifier use one 300B power tubes work at Class A Single Ended Triode no negative feedback configuration status to provide 9W adequate output . Moreover, It use the high quality output transformer ( Hasimoto . made in Japan).

The 6SN7 input tube use Jupiter Copper foil (wax paper and Polypropylene film) coupling cap to 6SN7 driver tube to driver Hasimoto A-107 Interstage transformer, This new design driver stage got the wide frequency range and very good sound. The interstage transformer direct coupling to 300B power tube. The 300B tube work at Class A Single Ended Triode mode to driver Hasimoto H-20-3.5U high quality output transformer , The Hasimoto H-20-3.5U 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
6SN7 driver tubes
Jupiter Copper foil (wax paper and Polypropylene film) coupling cap
Hasimoto A-107 Interstage Transformer driver the power tube.
Hasimoto H-20-3.5U CUT CORE orient high B Output Transformer
Hasimoto C-10-200W Choke
Hasimoto Power Transformer

BEST OF THE BEST 300B SET SOUND

Hasimoto H-20-3.5U Output Transformer

Specifications

Output and T.H.D :
1W per channel , 1kHz total harmonic distortion typically 0.45%
9W per channel , 1kHz total harmonic distortion typically 5% (rated output)

Input : RCA

Input Impedance : 100K ohm

Frequency Response:

Test at 1W 20Hz ~ 43kHz (20Hz -1.3dB, 20kHz -0dB, 43KHz -3dB)
Test at 9W 20Hz ~ 43kHz (20Hz -2.8dB, 20kHz -0dB, 43KHz -3dB)

Input Sensitivity : 0.55V / 9W (rated output) 24.7dB gain ( test at 8 ohm )

Output impedance : 4 ohm, 8 ohm , 16 ohm

Noise: Less than 1mV

Phase Mode : Normal

Construction: Copper and High quality aluminum

Tubes Required: 6SN7 x2 , 300B x 2, 5U4Gx 1

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

Total Weight: 19.5kg

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

Actual Price: HK$26,900

The output transformer from H-20-3.5U upgrade to use H-30-3.5S add extra cost $2880.

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