I built this myself from a kit over a decade ago. It still functions without any problems, but please consider that it is a self-made, used item. This model inherits the popular and best-selling TU-870, a popular introductory vacuum tube amplifier kit. It's a simple amplifier that uses the "6BM8" vacuum tube, a convenient tube that combines a pentode for power amplification and a triode for voltage amplification in a single glass tube. This is a new-dimensional vacuum tube amplifier that actively incorporates new technologies to enjoy digital sources with extremely low noise and distortion with the sound of a vacuum tube amplifier. Sometimes powerful, sometimes elegant. Please enjoy the unique sound of vacuum tubes. ● Vacuum tubes used: 6BM8 (ECL82) x 2 ● Rated output: 2.0W + 2.0W (at 8Ω) ● Rated input: 600mV ● Input impedance: 45kΩ ● Compatible speakers: 8Ω ● Residual noise: 80μV (IEC weighting) ● S/N ratio: 94dB (IEC weighting) ● Frequency response: 26～37,000Hz ● Input terminals: RCA (pin) terminals, stereo x 2 systems ● Output terminals: Speaker terminals (push terminals) ● Power supply voltage: AC100V 50/60Hz ● Power consumption: 35W ● Weight: Approximately 2.9kg ● Size: W130 x H133 x D263mm (including protrusions)