RCA 6HU6 / EM87 Tuning Eye Tube  
Written by AnubisTTP on 2007-09-05  


The EM87 is a linear "magic eye" style tuning indicator. Unlike more traditional magic eye tubes, which have a circular phosphor coated metal target, the EM87 has a strip of phosphorescent material applied directly to the side of the envelope. The shadow on this tube expands symmetrically outward from the center of the tube's phosphor strip, and will reach all the way to the top and bottom of the strip when fully extended. The tube has a 6 volt filament and a standard 9 pin base.


EM87 Tube
EM87 tuning eye tube, normal operation.

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