When you first see it, it’s hard to distinguish Power Tube 5500 from its predecessor. The shape is almost exactly the same, which is to say an extruded rectangle despite the “tube” name. We liked that the original version had a cap that popped off to reveal integrated Dock Connector and USB plugs; unfortunately, this one drops those in favor of bundling in a bunch of different cables and tips, plus a bag to hold them all. You connect…
