Summary

"Magic Eye" tuning indicator, used in radios from the mid 1930s until the late 1940s. Manufactured for: Osram. (Probably by Philips).
"Magic Eye" indicators provided a circular fluorescent display with a dark segment that varied in width in response to the automatic volume control (AVC) voltage.
6.3 volt indirectly heated cathode.

Physical Description

Six pin USA style base.

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