I just bought a 2008 Eden Metro. The store owner said it gigged twice and the original owner wanted something less heavy so I got a decent deal on it. It played fine through both channels yesterday. This morning I had my Fender J plugged into channel 2, the tube pre amp side, and as I was adjusting the gain with the main volume all the way down I saw the compression light come on. So I backed off the gain to 1 o'clock, raised the master volume and I got nothing but hum and a barley noticeable sound from the bass. Channel 1 sounds fine through both inputs. I pulled the head halfway out and can see that the tube is still glowing so I don't think I fried it. Can anyone give me a clue on what's going on here? It was fine yesterday.