Melodium 55A & 75A
Manufacturer:
MelodiumModel:
55A & 75ACountry of Manufacture:
FranceMicrophone Type:
DynamicPolar Pattern:
OmnidirectionalProduction Start Year:
1948Production End Year:
1958Rarity:
3
Frequency Response:
Microphone History:
From the Melodium catalogue of 1950:
MELODIUM Dynamic Microphones 75 A - 75 AAD and 55 A
A complete range of MELODIUM dynamic microphones, these devices are pressure-type: they feature an air-cushioned acoustic chamber and a compensating device that standardises their sensitivity between 50 and 10,000 Hz. Their shape allows them to be considered relatively insensitive to feedback.
Recommended for experienced technicians who care about quality, these microphones are stable, robust, wind-resistant, and low-humidity. They can be tropicalized upon request.
They come in the form of 60 mm cylinders. diameter, equipped at the front with a vertically adjustable perforated grille and horizontally adjustable brackets, with a 12 x 175 threaded base for mounting on a table stand.
The TYPE 75 A Dynamic Microphone has three balanced connection terminals on the rear. Types 75 AAD and 55 A have a locking plug on the rear.
Their response curve varies little with the angle of attack. A difference in efficiency between the front and rear waves of 5 decibels, or a voltage ratio of 1 to 1.7, is only evident at very high frequencies. The microphone can practically be considered non-directional.
Case decorated with oxidised silver plating.
From the 1954 catalogue:
The MELODIUM 55A dynamic microphone is essentially identical to the 75 A model, except that the voice coil impedance has been increased to 50 ohms for use with certain standard lines and that it is equipped with a locking output plug. The grille is perforated by stamping. The oxidized silver-plated housing is vertically adjustable and mounted on a horizontally adjustable bracket. A 12x175 threaded base allows it to be mounted on a table stand or the floor.
This microphone is particularly intended for broadcasting and in cases where equipment interchangeability is essential.
Technical Description:
From the Melodium catalogue of 1954:
OUTPUT IMPEDANCE: 50 ohms plus or minus 10% at 800 Hz.
FREQUENCIES: 50 to 10,000 Hz.
OUTPUT LEVEL: -55 dB for a pressure of 10 bars in open circuit. (Ref: 1 mW)
MAGNET: TICONAL with magnetic hardening.
DIMENSIONS: Height: 155 mm. Width: 70 mm. Thickness: 135 mm.
OUTPUT: Built-in locking plug.
WEIGHT: 630 grams.
