We did, just in time for the bouncers to notice the boom mike and battery packs. Wait, wait… maybe we should talk about why tube amps are worth this kind of trouble first. Yes, vacuum tubes do ...

Normally, vacuum tubes rely on a resistive heater to eject ... [J.G.] is powering this amplifier with a battery outputting 5V via a USB connection, and driving a fairly standard set of speakers ...