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.

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