Iv have a set/pair of Beolab 150 pluged in to a 5500, one of them the in not getting any power, Ive changed the pug fuse, is there one in side the speacker, if so how do I get to it.   Or maybe Iv blown the amp!

Welcome to Beoworld !

Probably just a fuse. Normally there's a very good reason for a fuse to blow but I've seen many cases of blown fuses in Beolab Penta's where the fuse was the only faulty component.

There is a small cover at the bottom of the amplifier. Remove this (one screw, I think) to gain access to the fuses.

Martin