This doesn't seem like a good fit. You can get 15-16W from a parallel 300B SET, but unless you listen at very modest volumes and have a fairly small room, an amp like this is probably not going to meet your expectations.
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?