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    The Bang and Olufsen BeoMic BM3 Microphone (Band Mikrofon - 3) is legendary. This vintage BM3 Ribbon Velocity microphone has the Dynaco label (Philadelphia Pennsylvania) and dates to the mid-1950's to 1960's. It is in excellent conditions as the pictures will attest. It comes WITHOUT a cable or a stand. (Sorry, that's how I got it.)

    It sounds lovely on acoustic guitar although Louis Armstrong sang and the Queen of England decreed through it (pictures below). This microphone inspired Royer  and they copied this design on their R-121 / 122 series. Stephen Sank likes to replace this ribbon.


He says

    "Installation of RCA 44-BX ribbon into all B&O ribbon mics, with results firmly in "Oh my God!" territory.  Turns a B&O into something so close to a 44-BX, it is difficult to tell the difference.  Priced at $150 for Mono models."

     

Beoworld States:

    Manufactured: 1955 - 1966
    Designer: Erik Rørbæk Madsen
    Bang & Olufsen Beomic 3 (150 ohms) and
    Beomic 4
    (multi- impedance) models were pressure-gradient full-bass microphones with a perfect figure-eight directional pattern.


    Features: No resonance peaks. Extremely smooth response. Bi-Directional - no side pickup. No frequency discrimination, front to back. High efficiency Nu-Metal transformer placed in microphone housing. Switch for muting and voice/music conditions. The miniature non-corrosive duraluminium ribbon was only 0.0001" thick and its weight only 1.3 mg. This negligible mass prevented any resonance within the audio range. Shock and blast proof. Ball swivel for tilting to any position.

 

    The condition of this item is:

      Tested Functioning Restored Physical Restored Electrical Silk Damaged Rusted Threads Worn Cable Absent Screws Missing Dent*Scratch*Crack Been Dropped Smoke Free NOS Element Intact Mint Self Noise High Sounds Great   Logo intact Rare Vintage

     

    The accessories for this item are:

      Original Case Original Papers Stand Included OEM Cable Set Original Box OEM Boom Mount OEM Stand Inc OEM Shock Mount OEM Lanyard

     

    The specfications of this item are:

      Ribbon/Velocity


      ** means negative (NOT / NO / hasn't been)
             means positive (yes / is / has been)


      BeoMic BM3 Microphone Product Specifications

        Specifications: Dimensions 195mm high, 30mm diameter
        Impedance 50 ohms balanced
        Response M position: 20-11000 c/s +/- 2,5 dB
        T position: 10 dB lower at 100 c/s
        Sensitivity M position, 50 ohms: 88 dB below 1V/µbar
        T position: 4 dB lower
        Response Frequency Characteristic:
              M (Music) Position: From 20 till 11,000 c/s +/- 3 dB
              T (Close Talk) Position (8-16") Rolled off below 100 c/s: 12 dB
        RTMA Microphone Rating GM (sensitivity): -158dB; Hum Sensitivity (RTMA) GH: -145 dB. RTMA Standard SE - 105. BM 3. Open Circuit Voltage Level: -88 dB, OdB = 1 Volt per Microbar
        Output Impedance: Nominal 80 ohms
        Rating Impedance: 150 ohms
        BM 4. Open Circuit Voltage Level:
              "L"-Position: -88 dB
              "M—Position: -81dB
              "H"-Position: -60 dB
        OdB = 1 Volt per Microbar
        Output Impedance:
              "L"-Position:
                  Nominal at 1000 c/s; 100 ohms
                  Rating Impedance: 150 ohms
              "M"-Position:
                   Nominal at 1000 c/s; 450 ohms
              "H" position:
                   Nominal at 1000 c/s; 60 k ohms
        Rating impedance: 40 k ohms
        Size: 7,75" x 1 3/16"
        Weight: 15 ozs approx.
        Cable: supplied with 20 feet twin cond. shld.
        Transformer type: 8016-JS for matching BM3 to a high impedance amplifier input available on special order
        mounting: Bayonette detach to 5/8" x 27 thread