I dont have the amp head version, rather I have the 1 x 12 combo. I bought it second hand in the 1990's and have gigged it hard ever since. It's travelled around alot in it's flight case and still going strong. When it has broken down (as amps will do during this time) then its always been a simple fix such as a blown fuse or a valve (or the power lights bulb). My amp once fell out a flight case and bounced down a set of concrete steps, All that had to be replaced was a couple of valves and the amp was back in action. These amps still hold their value and having been the proud owner of one I'm not surprised to see why.