Another marketing gimmick?

There's always a market for snake oil. The real question is how big that market will be.

I'll wager you could put the metronome inside a tube and it would stop that annoying "ticking" sound! 

dweller-

you're on to something....let's collaborate$$$$!

OMG, you guys are becoming a cult.

That's just an aesthetic take on a what reviewers say is a great sounding amp. It's a Gallium nitride power FET device that only the maker has access to, since he designed it. All other GaN devices are for radar and if used for audio, are modified or backward engineered. It replaces silicon devices as it's way faster.

Here's a review of it: https://6moons.com/audioreview_articles/agdproductions/

The reason he put it in a tube is, wait for it, he's somewhat an artist as well as an engineer.

All the best,
Nonoise

Would you prefer a boring black box at that price?