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Ariel Cabello

Bang & Olufsen Beomic BM3 with box

Designed by Erik Rørbæk Madsen in 1962

A fantastic looking microphone, tested and working.

Unique collector's item for a real B&O fan

Info from Beoworld: 

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.

Specifications: Dimensions 195mm high, 30mm diameter
Impedance, switchable 50 ohms, 250 ohms and 40 Kohms 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
M position, 250 ohms: 81 dB below 1V/µbar
M position, 40 Kohms: 60 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

Good - Number of items: 1 - Including: Ribbon microphone - + Extra item (see description)

Bang & Olufsen - BeoMic BM 3 Ribbon microphone

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Power cord

Remote control

+ Extra item (see description)

Power supply

Original user manual

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Power Adapter

No cables

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Microphone Shock Mount

+extra item (see description)

Anti-pop Filter

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1:12

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Creator

Dieter Rams

Japan & Related

Pier Giacomo Castiglioni

Achille Castiglioni

Excellent - Number of items: 1 - Including: Power cord

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Bang & Olufsen - BeoMic BM 3 Ribbon microphone

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