Telefunken 47-M
Not much is documented about the Telefunken 47-M. The one solid record in the archive is a microphone roundup in Audiocraft (November 1955, p.30). It listed the mic under the fuller name U-47-M, as a condenser microphone with a separate power supply. It was polydirectional, with a switch for unidirectional or omnidirectional operation. Response was rated at 30 to 17,000 cycles, listed output level was -123 dB, and a strap set it for 50- or 200-ohm operation. The 1955 price was $390.00.
Past that listing, surviving documentation is thin. No production years, circuit details, or further period reviews have turned up in the archive's sources. Known specs, all from the 1955 roundup:
- Condenser microphone with separate power supply
- Polydirectional; switch selects unidirectional or omnidirectional
- 30–17,000 cycles (Hz)
- Output level: -123 dB
- Impedance: strap for 50 or 200 ohms
- Price in 1955: $390.00
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