REISONG Boyuu A30 Single-end Class A HiFi Audio 2A3C Vacuum tube Amplifier

Great amplifier. The background is, but it is not critical and does not depend on the volume position knob. Replacement of lamps on the class above gives a significant increase in sound. For my speakers on the shpd Beyma sensitivity of 102db enough 3 Watts with a head. The sound is clear and transparent, the middle is soft and not crooked, the bass is clear and fast.excellent product!!