I went to the Sam Ash in Lombard IL over the weekend to see a brand new Sunn 300T ticketed at $599. I was ready to get out my wallet immediately based solely on what I have heard about the amp and what it typically sells for. However, I made the very wise decision to plug in and test it out first. After trying two different basses and two cables and getting no sound except for a slight hum that was a bit louder than the bass unamplified, I decided to ask one of the employess for help because I figured I was overlooking something. The guitar department manager explained to me that this was just a bum unit they have sent for repairs everal times and has never been fixed. My disappointment was great as it would have been nice to at least hear the sound I've heard so much about. If anybody in the Chicagoland area knows a lot about repairing tube amps, you could definitely pick this one up for cheap.