Amplifier is working in para Single end mode. 2 tube 2A3 parallel connection in single end mode in each channel. Output is up to 10W, no noise , no hum, sound is beautiful, rich and full of energy. You can use it with 2A3 tube too, but it is built for 45 and best performance with 45 tube. This use fixed bias, but you dont need to check bias often, just set it one time and let it play. You will be surprise with musical sound.

Specification: No NFB

Ouput power: 10W
Response frequency : 10Hz ~ 80K Hz
Noise : 0.3mV
THD 1W 0.1%

Tubes are not included.