RCA 6E5 Tuning Eye Tube  
Written by AnubisTTP on 2011-06-07  


The 6E5, which was introduced by RCA in 1935, is a common early model 'tuning eye' display. The wedge of darkness on the surface of the 6E5's green phosphor target 'eye' can be opened and closed electronically, allowing the tube to act as a replacement for a much more expensive mechanical meter movement in many devices where precision was not required. The tube also includes a built in amplifying triode, which reduces the input voltage needed to open and close the shadow on the phosphor target. This model of tube was manufactured in great quantity in the 1930s and 1940s, and 6E5 tubes graced the dials of nearly every high-end radio that was sold in the United States during this period.



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