War torn bass head needs a little tlc electronically. One output works ok the others need attention ( possibly output mosfet replacement) other wise functions ok. May even be sorted by switch cleaner on the Mono /Biamp switch. I never bothered I just used the good output in my rehearsal studio for years! Sold as a fixer upper but works if you use the single good output. The other outputs sound gritty and distorted. Cheap as chips for a 700 watt head! Any queries drop me a message.