LEM 409

1926, LEM designed and manufactured professional audio systems products.

Manufacturer Specification (translated from advert)

• TYPE 409 H. I. — Electrodynamic microphone; non-corroding metallic diaphragm; high-impedance output 80,000 ohms (grey enamel finish, polished front face), short-line model, maximum 8 metres - 131 NF (Nouveau Franc).

• TYPE 409 B. I. — Electrodynamic microphone; non-corroding metallic diaphragm; low-impedance output 50 ohms (grey enamel finish, polished front face), long-line model with 2-pin shielded output connector. 120 NF (Nouveau Franc).

• Non-directional: output socket with removable, shielded circular connector.
• Dimensions: 40 × 120 mm. Weight: 500 g.
• Microphones of this category are designed to be mounted on stands and are fitted with a 16-thread insert with 100 pitch.
• Frequency response: 60–10,000 Hz ± 6 dB.