> > > On Monday, April 25, 2022 at 11:45:22 AM UTC-4 Robert G. Schaffrath wrote: > >> "Magic Eye" tubes are some of my earliest memories of interesting >> displays when I was a child. My maternal grandparents had a Dumont TV >> (didn't everyone LOL?) that used a 6AL7 eye tube for tuning the built in AM >> receiver. > > I never saw one used as a tuning indicator though I messed with a lot of discarded valve radios in my youth. But I do remember the magic eye on my father's Telefunken tape recorder, used for the recording level. It was a linear tube with a central rectangular green section that grew and shrank.
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