It ended with a string of successes – a working vacuum chamber, light bulbs, glow tubes, diodes, and eventually this homebrew power triode and the audio amplifier built around it. [Simplifier ...

Especially when those parts include vacuum tubes ... heaters glow as bright as light bulbs, but that’s all part of the charm. Speaking of charm, we just love the amp these tubes went into.

I tested a pair of Écoute Headphones to figure out what's going on with them and have a sample for you. 0:00 intro 5:06 Audio ...