Description: " After World War II, Neumann regrouped his company and developed the U47. It was first marketed in June 1948. Distribution was by Telefunken, which promptly put their name on the amplifier housing. The U47 was the first switchable-pattern condenser microphone switching between cardioid and omnidirectional patterns. It incorporated the highly successful 12-micron-thick M7 capsule and VF-14 tube amplifier, which was a metal clad pre-World War II pentode configured to work as a triode. The hand-selected VF-14s had a 55-volt filament that operated at 36 volts for longer tube life and quieter operation. In the early 1950s, Mercury Records touted the U47 as its "Living Presence" microphone, putting pictures of it on record jacket covers. In 1956, thanks to the development of smaller capacitors, Neumann was able to reduce the length of the mic by almost three inches. The capsule finish was also changed from chrome to matte, matching the rest of the microphone. The U48, a cardioid/bi-directional version, was marketed in 1956. Two years later, Neumann took over distribution of its own products from Telefunken, restoring the Neumann logo. Gotham Audio became its North American distributor. In 1960, Neumann decided to update the U47 with the U67, which was originally called the U60 but later re-designated to indicate its ties to the U47. The U67 capsule design was switched from PVC to Mylar film, and a tensioning ring with screws (rather than glue) secured the membrane. Longstanding problems of proximity effect and overload during close work were resolved with a clever internal 40Hz cutoff filter and an amplifier pad switch allowing the choice of close-up or distant use. A three-pattern switch was added for extra versatility. An effort to minimize capsule resonance was made with a new tapered capsule windscreen, and the modern EF 86 tube allowed for a more streamlined, tapered body design. This particular shape remains not only in Neumann's line of microphones, but other lines of competing microphones today."
Specifications: -
Neumann U47 Specifications:
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Acoustical operating principle: |
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Equivalent noise level: |
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Pressure gradient transducer |
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26 (omni), 23 (cardioid), 25 (fig-8) dB
(DIN 45 405,CCIR 468-3) |
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Directional Pattern: |
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A-weighted equivalent SPL due to inherent noise: |
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Omni, Cardioid, Figure-8 |
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15 (omni), 12 (cardioid), 14 (fig-8) dB-A (DIN/IEC 651) |
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Frequency reponse: |
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Max SPL for less than 0.5% THD |
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40...16000 Hz |
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117 dB without pre-attenuation
127 dB with pre-attenuation |
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Sensitivity: |
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Phantom powering (P 48, DIN 45 596) |
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22 (omni), 28 (cardioid), 20 (fig-8) mV/Pa |
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48 V ±4 V |
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Rated impedence: |
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Current consumption per channel |
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200 ohms |
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0.8 mA |
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S/N ratio, related to 1 Pa at 1kHz: |
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Microphone Dimentions: |
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68 (omni), 71 (cardioid), 69 (fig-8) dB (CCIR)
79 (omni), 82 (cardioid), 80 (fig-8) dB-A
(A-weighted) |
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56 x 200 mm |
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Total dynamic range of the mic amplifier: |
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Weight: |
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115 dB (re DIN/IEC 651 A-weighted equivalent loudness level) |
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500 g |
(Manufacturer's information and "Placing in Operation Suggestions")
Conversion U 47, U 48 Nuvistor 13 CW 4, English, 06/1968 - 101 KB
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