Summary
Alternative Name(s): Interference Eliminator
Erla Selectoformer, radio frequency type. Made by Electrical Research Laboratories, circa 1927.
Covers 200 to 700 metres, type A, couples antenna to input of first radio frequency amplifier of receiver.
Physical Description
Cylindrical black bakelite case with a pair of terminals at each end. The four terminals are marked 'AN' for the antenna connection, 'GR' for the ground, 'F' for the tube (valve) filament, and 'G' for the tube (valve) grid.
More Information
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Collecting Areas
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Acquisition Information
Unknown Acquisition Method from Unknown Source
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Maker
Electrical Research Laboratories, Chicago, Illinois, United States of America, 1927
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Inscriptions
At ends: "AN" "GR" "F" and "G". On body: ERLA / SELECTOFORMER / TYPE WAVE LENGTH / A 200-700 / PAT. APPL'D FOR / ELECTRICAL RESEARCH LABORATORIES CHICAGO
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Brand Names
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Classification
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Category
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Discipline
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Type of item
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Overall Dimensions
56 mm (Length), 37 mm (Width), 42 mm (Height)
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