I picked up one of these locally a few years back from a guy who didn't even know what it was, but thankfully I knew what it was lol. The look on his face when I plugged my bass into it in his basement was priceless. "How much did I say I wanted for that thing again!?"
Unfortunately I don't really know anything about it. Earth Concertmaster. Also unfortunately I can't post an image until I have 10 posts in here so my apologies