Tube amps and Class A rated amps definitely consume more power. You get what you pay for... I'll take a 300 watt consuming Jadis over a 70 watts consumption Technics any day.
Also, keep in mind that you don't want to leave a tube amp on all of the time. Output tubes are expensive to replace and when on all of the time you will be replacing them at least once a year.
Also, keep in mind that you don't want to leave a tube amp on all of the time. Output tubes are expensive to replace and when on all of the time you will be replacing them at least once a year.