Hi
That's a start. It is a very simple amp.Not even a power switch or if there was one, it was removed . I think it was hardwired into whatever power source with the fused hot lead. I got a switch , actually a light switch with a plastic housing to mount it into and it works for powering off instead of pulling out the fuse.
There are no switches for modes or in out and very simple build.It puts out way more than 80 watts.How long that would last is anyone's guess.
thanks
Chris