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'No tube, no Hi-Fi' - tube offers the magic sound that no solid state amplification can duplicate. But you don't have to have a 50 lbs tube amp to enjoy Hi-Fi.... we bring great sound right to your desk with a foot print size of a CD case. All aluminum sliver finish also served as heat sink 6N3 tube pre-amplification for warm mid range sound Transistor output stage You may use GE 5670 or WE396 to replace stock 6N3 tubes Specifications: Output Power: 2 x 2.5W (8 ohm, RMS) Frequency Response: 50 Hz to 40 kHz Input Sensitivity: < 220mV THD: less than 2% (1kHz) S/N ratio: >= 85 dB (A weighted) Crosstalk Attenuation: >= 35dB Overload voltage: 10V Input Impedance: 20k ohm Power supply - 110-115V / 60Hz Power consumption: 20 watts Size: 4€³ W x 4€³ H x 4 1/4€³ D Weight: 1.4kg / 3 lbs net This amplifier can drive all mini speakers listed on this website. Perfect for building a small sized bedroom or study room system without sacrifice sound quality.