Boyuu BYA9 EL34 tube amplifier HIFI EXQUIS single-ended Tube Amp A9

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The finished assembled product can be ungraded with two bigger output transformers(76-40),  please choose version:  "Upgrad output transf"

The standard version output transformer is (66-36).

More details




  • Standard version
  • Upgrade version
  • DIY Components SET

"Upgrad output transf" option is ungraded with two bigger output transformers( 76x40 ):

“The standard” version output transformer is ( 66x36 ):

A9's Technology:

  • Power transformer : using imported 0.35 core, pretty neat, several complex vacuum impregnation.
  • Chassis : Professional design, the surface does not have a screw.
  • Output transformer : Stretching potting outer garment, potting moistureproof processing.
  • Power parts : Dual high-voltage full-wave rectifier tube 315V +315 V, use of imported iron core as power inductors, camp-type power supply filtering,  ruby supply filtering.
  • Enlarge parts : Use Japan SUN classic lines, every channel uses two three common cathode tube parallel amplification with high output voltage, drive current is large and other characteristics, voice full speed, treble transparent, smooth.

A9's Materials:

  • Power transformer : using 96-60 large power core design power of 200W, high flux thick silicon steel imported 0.35. Oxygen-free copper enameled wire using domestic manufacturers layered tightly wound, with very low load current characteristic, no vibration, no buzz.
  • Output transformer : divided into segments of tightly wound, using the Japanese ultra-thin electrically insulating paper of pure wood (thickness of only 0.06MM, withstand voltage 2000V).
  • Capacitance : Imported fever capacitors do filtering (Netherlands, Philip, Japan ELNA, Japan Ruby, etc.). Coupling using the Netherlands Philip tonic special grade audio capacitors, transparent sound elegant.
  • Dimensions : width 315 depth 280 height 155  

Basic technical parameters:

  • Output Power: 12W * 2 (ultra-linear connection).
  • Frequency Response: 20Hz - 28KHz.
  • Output impedance: 4,8Ω.
  • Total Harmonic Distortion: ≤ 1% (1kHz).
  • Input Sensitivity: 750MV.
  • Input impedance: 100KΩ (two input signals)
  • Dimensions (W × D × H): 310 × 268 × 165mm.
  • SNR: 88dB.
  • Voltage amplifier tubes: Shuguang 6N9PJ × 2.
  • Power output tube: Shuguang EL34B × 2.
  • Rectifier tube: Shuguang  5Z3PJ × 1.
  • Power transformers: new imported 0.35, stacked thick 60MM (96-60).
  • Output transformer core: new imported 0.35 dedicated audio .
  • Speakers outputs : high level export-oriented plugs, with transparent banana inputs
  • input voltage: 110-240v version available

The finished assembled standard amplifier description:

  • Power transformer 96-60.
  • Epoxy potting dedicated audio output transformer (66-36).
  • SHUGUANG for export EL34B CPI tube output.
  • New 6N9PJ parallel amplification, the intensity is two times to the normal line.
  • Hand scaffolding welding.

The back view for upgrade version:

The inside architecture view:

By (Ipsach, Switzerland) on 23 Sept. 2017 (Boyuu BYA9 EL34 tube amplifier HIFI EXQUIS single-ended Tube Amp A9) :
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