Tempo:
A sound visualizer built with Soviet ИН-13 bar graph tubes and a French metronome case from the early 1900s. Incorporating a simple analogue circuit, it is intended to stand near a home audio system, creating a glowing representation of the music being played.
The original winding key functions as the power switch.
Can be adjusted for incoming signal level.
2017.
There is a video.
$625.