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SPECIFICATIONS
Type:
Dynamic
Frequency Response:
60 to 10,000 Hz. See Figure B.
Polar Pattern:
Omnidirectional.
Output Level:
1,000 Hz. Response
Models 51 and 51S "L" Position:
Open Circuit Voltage Level..- 78.5 db* (0.118 mv)
Loaded with 40 ohms..........- 85.0 db*
Power level into 40 ohms.....- 51.0 db**
E.I.A. Microphone Rating
Gm (Sensitivity)..............-144.0 db***
Models 51 and 51S “M” Position:
Open Circuit Voltage Level ..- 71.5 db* (0.265 mv)
Loaded with 250 ohms ........- 77.0 db*
Power level into 250 ohms...- 51.0 db**
E.I.A. Microphone Rating
Gm (Sensitivity)..............-143.0 db***
Models 51 and 51S “H” Position:
Open Circuit Voltage Level ..- 48.5 db* (3.75 mv)
Loaded with 100,000 ohms..- 51.0 db*
E.I.A. Microphone Rating
Gm (Sensitivity)..............-145.0 db***
* 0 db = 1 Volt per Dyne per sq. cm.
** 0 db = 1 Milliwatt with 10 Dynes per sq. cm.
*** E. I. A. Standard SE-105, August 1949.
Microphone Rating Impedance:
Equipped with multi-impedance switch,
furnishing a choice of 3 impedances: "L" for
connections into microphone inputs rated at 25
to 50 ohms; "M" for connections into microphone
inputs rated at 150 to 250 ohms; and “H” for
connections into high impedance microphone
inputs.
Cable:
15 foot (4.6 m) two-conductor shielded with Amphe-
nol MC3M type microphone plug on the microphone
end
Case:
Chrome-plated die cast.
Dimensions:
See Figure C.
Switch:
Model 51 None
Model 51S Built-In “ON-OFF” switch to control mi-
crophone circuit. The switch is an integral part of the
receptacle assembly and is a slide-to-talk lock-ing
type switch.
Net Weight (Less Cable):
1 ¾ pounds (794 grams)
Packaged Weight:
3
1
/
8
pounds (1,417 grams)