Hey all. I've just acquired a Darkglass Microtubes 900 V1 for the ludicrously low price of $130 out the door at a local pawn shop. I brought it home to test out and it fires up and puts out signal. The switches and knobs all work, the fan works, all the lights work... Seems to be in fine working condition. Cosmetically it's a 7/10. It is missing the footswitch. For this price I keep expecting something to be horribly wrong with it. Are there any issues common to these amps that I should be on the lookout for? Thanks!