Modern tube amplifiers are easy to operate and extremely reliable, providing years of enjoyment with little to no maintenance. Occasional bias adjustments are simple with the included bias metre and take seconds to complete. An absolutely amazing integrated tube amplifier with built in DAC, Phono, Remote and Headphone input. Read our blog to see our first impressions. Cayin is the largest tube amplifier manufacturer in the world and build many of the famous brands costing several times more than this original.