I have been getting back into Hi Fi, and would love to get some of those awesome amps I couldn't afford when they were new and I was a kid. Several for sale right now, an M-4, M-80, M-70, M-50 and a MX-1000. Cruising AK there are a lot of threads about restoring/repairing, but how typical is the need to do serious work on some of these older amps? I am quite technical, but not a repair tech. Trying to decide if i shouldn't pony up and go with newer? (I like the older stuff better though...) I picked up a C-45 from thrift and a MX-55 on CL to get started, but would like to go bigger/better.