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MULLARD EM1 TUNING INDICATOR MAGIC EYE, 1936
Mullard end viewing Tuning Indicator with side contact base type Ct8. The EM1 followed the TV4 . The EM1 was introduced to eliminate the problems associated with the old TV4, and had a 6.3v heater.
The tube shown has a concave disc inside that is illuminated on the sides of the bottom edge, as the signal is increased the two illuminated edges move towards each other in an arc until they touch at full signal.
A later version of this the EM34 can be demonstrated.
Your comments:
- When I was at school in Kitwe, Northern Rhodesia I used to repair radios in order to augment my pocket money. I remember these "magic eye" tuning indicators very well
.......... Charles Frizell, Canterbury, UK, 3rd of April 2018
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