[ErikaFluff] needed an amp for her Grado open cans. Rather than build yet another boring black box, she built what may be the most awesome headphone amp ever by adding a tiny CRT which displays ...

After that, the audio is brought up to volume by an op-amp style headphone amp circuit. Side note: I wrote up a few short notes on the Sidekick LX I got today, if you dig that sort of thing.