More Jack Boxes

BC-1366 jack box (at right), with FL-30 range filter to its left
A later AAF/AAC jack box, with a combination Liaison and VHF radio position. The range filter is also a later model, with sharper bandpass characteristics. The small box below the BC-1366 is a transformer for using the later low impedance earphones with a high impedance amplifier output - a change in design philosophy that occured in about 1944.

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