It has around 9 watts per side. My speakers are 92dB efficient so they are not an issue, just the front end drive voltage. It has a 5r4 rectifier tube, I believe it is Tektronix labeled (not sure of the manufacturer).
Just FYI, the amp needs around 1.5 volts for maximum output and my phono stage outputs around 400 mv. I don't have space for a linestage and interconnects, just a want true integrated amp.
