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MIL-DTL-18239 Earphone H-87B/UThis 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.

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MIL-DTL-18239E(AS)
3.3.6 Cementing compounds. Any cementing compound used in the construction of the
earphone shall withstand all service and test conditions outlined in section 4 without evidence of
loosening or otherwise affecting the performance requirements of the earphone.
3.3.7 Moisture and fungus-resistant treatment. Earphones shall be fungus proofed by
selection of parts and materials as non-nutrient for fungus or the parts and materials shall be
treated prior to their use in the earphones.
3.3.8 Interchangeability. The earphones shall meet the interchangeability requirements
specified in MIL-E-5400.
3.3.9 Weight. The weight of each earphone shall be not greater than 2.5 ounces.
3.3.10 Size. Dimensions specified in figures 1, 2, and 3, including overall size contours,
holes, hole locations shall be met.
3.3.11 Surface treatment and finishing.
3.3.11.1 Surface treatment. Surface treatment of metal parts shall be in accordance with
MIL-S-5002.
3.3.11.2 Finishing. Finishing shall conform to MIL-F-14072.
*  3.3.12 Soldering. Only resin, or resin and alcohol, may be used as a flux in the assembly of
this equipment or any part thereof, except that an acid flux may be used on all metal, nonelectrical
subassemblies provided that they are thoroughly and completely cleaned of all traces of the acid
immediately after the soldering operation has been completed. Soldering shall be in accordance
with J-STD-001, Class 3.
3.3.13 Pressure. The earphones shall be designed such that equalization of the pressure on
both sides of the diaphragm shall take place when the earphone is subjected to changes in ambient
pressure down to 3.4 inches of mercury.
3.3.14 Explosive decompression. The earphone unit shall be designed so that the unit will
show no structural failure or defect and only minor changes in frequency response characteristics
(less than 3 db) as a result of the explosive decompression test (see 4.7.16).
3.3.15 Nomenclature and nameplates. Nomenclature assignment and nameplate approval for
equipment identification shall be in accordance with MIL-N-18307.
3.4 Performance.
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