A single-ended 2a3 amp rated at 10-watts is REALLY pushing the tube hard. A friend who makes amps actually likes to push 2a3s and 45 pretty hard, but, then again, he has hundreds of tubes of those types and doesn't care if the tube does not live for a long time.
From my experience with 2a3 and 45 amps, the music that would most show off the power limitations of the amp would be large scale choral music, particularly if their is an emphasis on bass voices. For some reason (unknown to me) the amp will show obvious headroom limitation at surprisingly low subjective volume levels. But, for most popular music, which have limited dynamic range, low-powereed SETs can sound very good at reasonable sound levels. B&W speakers are not known to be an easy load, and 88 db/w is supposedly outside of the recommended efficiency, but if it works for you, GREAT.
One of the other things about good amplifiers, and SET amps in particular, is that one tends to be fully satisfied with the sound when playing at lower volume levels; if you have to crank it up for the music to come to life, the amp sucks.
From my experience with 2a3 and 45 amps, the music that would most show off the power limitations of the amp would be large scale choral music, particularly if their is an emphasis on bass voices. For some reason (unknown to me) the amp will show obvious headroom limitation at surprisingly low subjective volume levels. But, for most popular music, which have limited dynamic range, low-powereed SETs can sound very good at reasonable sound levels. B&W speakers are not known to be an easy load, and 88 db/w is supposedly outside of the recommended efficiency, but if it works for you, GREAT.
One of the other things about good amplifiers, and SET amps in particular, is that one tends to be fully satisfied with the sound when playing at lower volume levels; if you have to crank it up for the music to come to life, the amp sucks.