recordinghacks

OmnidirectionalCardioidBidirectionalNeumann U 47

discontinued Multi-Pattern Condenser Tube Microphone

Neumann U 47

Description

The original “U 47,” invented in 1947, was the first switchable pattern condenser microphone. Its impact, especially in America, was such that the dominance of RCA’s ribbon microphone as the studio standard was eclipsed.

The U 47 had a double diaphragm capsule. Both diaphragms could be polarised with the same voltage or neutralised with respect to the center electrode, so that the omnidirectional and cardioid characteristics were adjustable. A ‘special’ (U 48) was also produced, in which the diaphragms could be polarised with opposite voltages with respect to the center electrode, so that it was possible to switch between cardioid and figure of eight directional characteristics.

Bill Bradley

There were about 5000 [U-47s] made, about 3200 long bodies and the rest short. People say it’s gotta be a long body to be any good. False. They’re exactly the same microphone inside.

The mic went through three revisions. They started off with a very large transformer/capacitor package. If you pull the covers off you won’t believe, they’re packed. There’s no room for anything in there. If you take exactly the same mic that’s five or six years younger, take the shell off — you’ll wonder where the mic went.

The Neumann U 47 is also known as: U47.

The mic was released in 1947.

Pickup Patterns Pads & Filters
  • Omnidirectional (35 - 15,000 Hz)
  • Cardioid (35 - 15,000 Hz)
  • Bidirectional (35 - 15,000 Hz)
Diaphragm size Impedance Max SPL
n/a n/a n/a
Weight Length Max Diameter Interface(s)
800g (28.22oz) 240mm (9.45'') 60mm (2.36'')
  • 3-pin XLR male (1)
Power Specifications
  • Requires External Power Supply

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