This tube amp delivers just 11W but other than that it's as good as perfect according to TR's reviewer.
"How much power is necessary for most kinds of music given an average-sized room?
Well, the Consonance Cyber 10 Signature offers just 11 watts RMS at 1kHz, with harmonic distortion rated at about one per cent at seven watts.
Frequency response goes from 6Hz to 60kHz (-3dB) at eight watts output and a signal to noise ratio of 87dB is claimed. Input sensitivity is 180mV."