"Magic Eye" tuning indicator used in domestic radios in the 1950s. The EM34 was unusual in that it had a dual display with two sensitivities to handle both weak and strong signals.
"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.
Manufactured by Mullard Electronic Products Ltd., England.
6.3 V indirectly heated cathode.

Physical Description

Tubular bulb on octal base. Red paint on bulb, flaking off.

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