18A

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The 18A is a three-channel HF AM Transmitter supported by a 411 external power supply. For remote operation, a 451 Engine Generator (110VAC) was available.
The model shown below, complete with a Brush Crystal microphone, was constructed specifically for the Columbia Broadcasting System (CBS).

18A, Front View
18A Transmitter, Front view
18A, Top View
18A Transmitter, Top view
18A, Bottom View
18A Transmitter, Bottom view

Circa

1936