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"Magic Eye" tubes are a type of tube common in older radio sets. Consisting of a fluorescent "target" area and a simple deflector electrode, these tube were used as tuning and VU indicators. As they literally operate at the speed of electricity through a wire, they still have application where a device that can indicate instantaneous changes is needed.

"Magic Eye" tubes are a type of tube common in older radio sets. Consisting of a fluorescent "target" area and a simple deflector electrode, these tube were used as tuning and VU indicators. As they literally operate at the speed of electricity through a wire, they still have application where a device that can indicate instantaneous changes is needed.

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[–] • 2 pts

I was looking at those and I may use one in my personal amp where cost isn't really an issue -and I would know exactly what it was measuring- but most guitarists don't have a need for a VU meter besides the COOL factor. That's only if I ever get this damn business off of the ground.