Hi! I've just bought a silverface bassman 50. I had the chance to try a 66 bandmaster in the shop as well, both are great amps, but (at least in this case) bassman reaches darker sounds keeping brightness, while bandmaster seemed brighter but lower sound, it is 40W and bassman's got 50. On the other hand bassman has neither tremolo nor reverb channels, bandmaster has not reverb... anyhow both are great amps, sure you won't make a mistake 😛