I occasionally get invited to sit in with a local blues band called Crosscut Delux (@Modern Saint has played with them before) and the "guest" amp is usually the other guitarists' silverface Princeton that he's rebuilt himself and put a custom 12" speaker in that is just KILLER. The speaker is a Weber that has a Jensen-style cone but in a Celestion frame so that it would fit around the output transformer in the amp. If you can turn it up is breaks up beautifully and when you can't (notice that it is on 2 in the pic) it gets along with pedals like my Scott Henderson RC Booster or the other guys' Wampler Clarksdale) quite well. Someday I'd love to get an amp like this. Its like my Deluxe Reverb but a little better suited for blues gigs.