Every time I see this topic I think I should take a picture of Mike Mixer. I finally did, so here's Mike Mixer. I have no recollection of where I got him, probably Goodwill.
He sounds pretty great. I remember there were only two transistors inside. What I know about analog circuit design can fit inside an Altoids tin, but if you have an amplifier with only one transistor, doesn't that mean it has to be class A?
My friend Chris and I took him to the beach one time and recorded acid jams with some battery-powered synths for a couple of days. That was a clean recording. No AC around for miles.