Boyuu A9 EL34 Single-ended Pure Class A tube amplifier DIY Kit
Boyuu A9 EL34 Single-ended Pure Class A tube amplifier DIY Kit
Boyuu A9 EL34 Single-ended Pure Class A tube amplifier DIY Kit
Boyuu A9 EL34 Single-ended Pure Class A tube amplifier DIY Kit

Boyuu A9 EL34 Single-ended Pure Class A tube amplifier DIY Kit

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Model: Boyuu A9
Starting at: $198.99USD

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Shipping Weight: 13Kg 10 Units in Stock
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This is kit and need you solder it by yourself, it's very suitable for love DIY hifi friends. You must be good at DIY tube amp. If you are an entry-level DIYer, please don't buy the KIT. The KIT's price is included the KIT and a circuit diagram only. The service charge is not included, service charge cost very very high because we are not good at DIY, sorry for this. Some of my buyers ask a DIY KIT, so, we list one to test.
If you need a DIY KIT, choose Ver A. If you want the finished tube amplifier, choose Ver B, Ver C or Ver D.
Ver A: Output transformer 66-32 DIY Kit;
Ver B: Output transformer 66-32 finished amp;
Ver C: Output transformer 66-36 finished amp;
Ver D: Output transformer 76-40 finished amp.

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 amplification tube: 6N9PJ × 2.
power output tube: Shuguang EL34B × 2.
rectifier tube: 5Z3PJ × 1.
Power Supply Voltage: AC 100V - 240V / 50Hz-60Hz (100V, 110V, 120V, 230V, 240V version will take 3-14 work days to order), 220V version is in stock.

Power Transformers: new imported 0.35, stacked thick 60MM (96-60).
Output transformer core: 0.35 new imported audio-specific piece (66-32 (Ver A, Ver B)), (66-36 (Ver C)), (76-40 (Ver D)).
Output Block: high-end export-oriented base, with transparent sleeve.
New 6N9PJ parallel amplification, the intensity is two times to the normal line.

A9 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 for (66-36 (Ver C)), (76-40 (Ver D)). (Ver A, Ver B) is 66-32 and it is NOT epoxy pouring sealant
Power lines: Dual high-voltage full-wave rectifier tube 315V +315V, use ​​of imported iron core as power inductors, camp-type power supply filtering, import Philips / ruby supply filtering.
amplifier Line: Use Japan SUN classic lines, each channel uses two triode cathode tube parallel amplification, with high output voltage, drive current is large and other characteristics, voice full speed, treble transparent, smooth.
A9 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 hifi capacitors do filtering (Netherlands, Philips, Japan ELNA, Japan Ruby, etc.). Coupling using the Netherlands Philips tonic special grade audio capacitors, transparent sound elegant.

There is something difference between Ver A Ver B and Ver C, Ver D, the Output transformer is (66-32 (Ver A,)), and the cover of transformer is NOT epoxy pouring sealant. And the Appearance is a little different. Visit the picture please.