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Amphenol 91MPM4L 4-pin miniature male cable plug inline cord mount New Made in USA

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91MPM4L
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  • Amphenol 91MPM4L 4-pin miniature male cable plug inline cord mount New Made in USA
  • Amphenol 91MPM4L 4-pin miniature male cable plug inline cord mount New Made in USA
  • Amphenol 91MPM4L 4-pin miniature male cable plug inline cord mount New Made in USA
$12.99
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Description

Amphenol 91MPM4L 4-pin miniature male cable plug inline cord mount New Made in USA

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The Amphenol 91MPM4L is a 4-pin miniature male cable plug (inline/cord-mount) from the vintage Amphenol/Wire-Pro 91-series miniature audio/power connectors. It features:
  • 4 contacts (typically arranged in a roughly square pattern, not fully in-line).
  • Screw-type threaded coupling (positive locking ring).
  • Long shell/barrel ("L" suffix indicates extended shell length for better grip/cable support).
  • Chrome-plated brass shell, phenolic dielectric, designed for shielded or unshielded cable (up to ~1/4" diameter).
  • Intended primarily for low-voltage audio, microphone, control, or power applications in portable equipment.
This connector (and the 91-series family in general) was popular in the 1950s–1980s for microphones and related cabling in CB radio, public address (PA) systems, early ham radio accessories, and some broadcast/test equipment. It is not a common standard for the main microphone input on most amateur radio transceivers (which more often used 4-pin or 8-pin round connectors like Jones/Cinch, Amphenol 80-series, or later 4/5/8-pin DIN).Amateur Radios and Equipment That Use (or Can Use) the 91MPM4LDirect evidence is limited (the 91MPM4L appears mostly in surplus/NOS sales and vintage audio catalogs), but the 91-series 4-pin variants (including 91MPM4L) were used on:
  • CB radio microphones (late 1950s–early 1960s): Many early CB mics used 4-pin miniature Amphenol 91-series plugs (91MPM4L or similar) for the cable end. These were common before the standard 4-pin "CB-style" round connectors (like 4-pin screw-on or 4-pin plastic) became dominant in the 1970s. Ham operators repurposing CB mics often encountered these.
  • Vintage high-impedance microphones (some Electro-Voice, Turner, Astatic, or PA/broadcast models): The 91-series was used for mic cable plugs in shielded audio setups, especially where a compact, threaded, multi-pin connector was needed.
  • Yaesu FR-101D VFO jack (mentioned in some ham parts listings): The 5-pin version (91MPM5L) is explicitly noted for Yaesu FR-101D external VFO connections, so 4-pin variants like 91MPM4L appear in similar vintage Yaesu accessory or mic contexts (though not primary mic input).
  • General ham radio accessories (e.g., external keyers, control boxes, or custom mic cables): Used in homebrew or modified setups, especially for 4-conductor needs (audio, PTT, ground, and spare/up/down).
It is not the standard mic plug for major ham transceivers
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