How efficient? You may also want to take a look at the Japanese made Almaro SET integrateds, their 318B is 18 watts. And has wonderful reviews on 6mooons.
The Audio Space AS-3i. It may be a little over your limit but not much. It's a very good-sounding EL34 integrated with 3 inputs, user-selectable feedback and front panel triode/ultralinear switch. Easy to bias too; and looks cute.
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