This vintage Crystalab Metronome is a must-have for any music enthusiast. With its beautiful wooden design and brown color, it is a perfect addition to any collection. It is suitable for most musicians and is a great accessory for practicing rhythm and timing. This Metronome has a unique history, as it was invented by the Crystalab company and has a patent application pending. Its country of origin is unknown, adding to its mystery and allure. It falls under the category of musical instruments and gear, and is specifically classified as a general accessory. Don't miss out on the opportunity to own this vintage piece of music history. I listed for parts or repair because I don?t know how to use it. The tube has power