I've seen as high as 28 watts in a push/pull 300B amp but the sound of a SET amp is at least as much that it's single ended than the tube choice. SET amps are high in second harmonics due a lot to their topology which compresses the negative half of the input relative to the positive side.
High powered single end 300b recommendations
I would like to try a se 300b integrated to find out what the famed sound is like. However, at 86db, my Harbeth S-HL5 are not very efficient. They need more like 25-30W to drive them.
Any recommendations on an 300b amp that will work with these speakers?