Do-Re-Mi 351 MN

The brand name Do-Re-Mi is a clever play on words as it represents the first three notes of the musical scale, but is also a contraction of the company name "DOLFIN RENATO. MILANO". 

From an advertisement in Listino Tecnico MN - May 1950

• Highly magnetized alnico steel magnets
• Frequency range (linear curve) 50 - 9000 Hz. -
• Average output level = 54 dB
• Pre-wired impedance 50,000 ohms; Pre-set impedance (on request) 250 ohms
• Total weight of head and cable 1000 g
• Cylinder dimensions: 120 mm high by 60 mm deep

Cylindrical construction in stove-enameled, self-magnetic metal with a heavily chromed headband - Double protective mesh - Specially designed, space-saving transformer housed inside the microphone itself -

Panoramic head - Double-screw mounting adapter - Special 5-meter rubber microphone cable with shielded terminal for coupling to the amplifier.

From the manufacturer's document.

"IL MICROFONO A NASTRO "do. re. mi.„ Mod. 351 MN - Serie "Fedeltà"

This type of high-fidelity microphone offers all the advantages of types classified as "speed," solving even particularly difficult acoustic problems with its unique performance.

In fact, its uniform response across the entire musical frequency range (50-9000 Hz) and its bi-directionality make it particularly valuable in environments with environmental reverberation, while it is recommended for universal use in recording studios, musical auditions, theaters, churches, open-air auditions.

The bidirectionality, an inherent quality of this type of microphone, allows for the faithful reproduction of all sound sources arranged perpendicular to the rear and front faces of the microphone unit, while significantly attenuating signals incident in other directions.

This microphone eliminates the defects resulting from the use of membranes (pressure doubling, cavity resonance, etc.) and, we repeat, minimizes the effects of lateral reverberation (Larsen effect).

Its all-metal construction, meticulously designed and specially protected from external agents, makes it impervious to temperature variations. The extremely intense magnetic field, achieved by a trio of large, highly magnetized magnets, solved the performance problem by achieving a relatively high output level.

Instructions for use

This type of microphone requires the use of a preliminary amplification stage. Our preamplifiers and mixers (ask for the "Pre-July 1949" price list) were designed for this purpose. The built-in transformer is designed for two impedances: 250Ω and 50,000Ω. It is normally connected to the latter.

If you wish to use the 250Ω impedance, simply remove the metal cap and move the plug of the insulated cable following the instructions on the label located on the back of the microphone itself.

No special precautions are necessary for using this microphone, except that you should not disassemble it because the ribbon is very delicate and could easily be damaged. Return it intact to the supplier. Do not shake it, do not blow on it. To check its operation, simply touch it lightly with your hand.

When not in use, the microphone should preferably be kept horizontal, unscrewing it from its stand and wrapping it before placing it back in its box.