I just re-acquired a USA Eden WT550 after a few years of mostly playing a DB750 and then a Genz ShuttleMax 12.0. Those are both great amps, albeit different ends of the tone spectrum, but for me, a p-bass into a WT550 into a couple Acme Low B2s is tone heaven—smooth, rich, punchy. What a great, great head. What head did you come back to after a long break? Why?