Well judging exclusively from the heat that comes out of my ARC Ref 2 mk 2, tubes use up a lot of energy, fortunately for me I live in Canada so the preamp also acts as a space heater!
Tube amps and power consumption
A few days ago, I almost bought a Jadis Orchestra, pretty confident that it was among the best tube integrated I could get. Then, I read the specs and I found out its power consumption was 300 watts. That's a lot compared to my actual amp, a SS 100 watts per chanel which uses only 70 watts. My amp is on all day long so I figured that the Jadis consumption was excessive. Do ALL tube amps have such a power consumption?