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Harmonic Audio model: 211 mono-blocks

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(Simple test conditions)
  • Output power: 18W
  • Harmonic distortion: 1% (1kHz)
  • Frequency response: 20Hz (2.5dB) ~20kHz (1.8dB)
  • Input sensitivity: 200mV
  • Input impedance: 100KΩ
  • Output impedance: 4Ω 8Ω 16Ω
  • Noise: <1mV
  • Signaltonoise ratio: 92dB
  • Net weight: 42kg
  • Total power consumption: 200W
  • Use vacuum tubes: 211×1, 12AU7×1, EL84×1, 5U4G×1, 6AX4×2
  • Overall volume: (W×D×H): 600 x 400 x 400mm
  • Power supply voltage: ~120V±5% (60Hz)
  • Working conditions: temperature: 0~40, humidity: 20%~80%
  • Storage conditions: temperature: 20~70, humidity: 20%~90%


1. Pointtopoint wired, handmade DHT amplifier.
2. Highvoltage rectifier tube.
3. Highvoltage power supply.
4. Filament power supply with dedicated transformer.
5. Low impedance, high quality, highvoltage power supply without electrolytic capacitors.
6. Two EI type single-ended output transformers that use high-end special technology.
7. Japanese ALPS highend potentiometer.
8. Fine adjustment bias control for the 211 power tubes.
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