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RMS Audioworks RMS47

Multi-Pattern Tube Condenser Microphone

The RMS47 is a recreation of the Neumann U47. It is a handbuilt microphone, utilizing components selected to best reproduce the sound of the original U47.

Two capsules are available: a K47 and an M7. Both capsules were offered by Neumann, and both share a backplate design. The K47 uses screwed-on clamping rings (O.D. 34mm), while the M7 famously uses glued-on diaphragms on a 32mm backplate.

The RMS47 uses AMI’s BV8R transformer, a 6.5:1 ratio transformer wound with nickel alloy lamination to the original U47 transformer specs.

The tube is described as a VF14ER, about which more details are forthcoming. (The U47’s VF14 steel tube has not been manufactured for over 50 years; non-microphonic VF14s are rare and very expensive, necessitating the use of alternative parts in U47 recreations.)

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The mic was released in 2012.

Specifications

Pickup Patterns	Pads & Filters
Omnidirectional (n/a mV/Pa; n/a) CHART Cardioid (n/a mV/Pa; n/a)

Capsule Dimensions	Impedance	SPL/Noise
Diameter n/a	n/a

Weight	Length	Max Diameter	Interface(s)
n/a	n/a	n/a

Power Specifications

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