MIL-DTL-18239E (W/ AMENDMENT-1), DETAIL SPECIFICATION: EARPHONE H-87B/U (25-NOV-2013)

MIL-DTL-18239E (W/ AMENDMENT-1), DETAIL SPECIFICATION: EARPHONE H-87B/U (25-NOV-2013)., This specification covers one type of moving coil, dynamic type earphone designated as H-87B/U. This earphone transforms electrical energy into acoustical energy and may be acquired normally as component parts of a complete headset assembly. See 6.1, for information about use with cord assembly P/O H-87B/U, as specified in MIL-DTL-18266.