Warm Audio WA-47 Large-Diaphragm Tube Condenser Microphone

BH #WA47 • MFR #WA-47
Warm Audio
Warm Audio WA-47 Large-Diaphragm Tube Condenser Microphone
Key Features
  • Nine Polar Patterns
  • K47-Style Capsule Reproduction
  • Gold-Sputtered, 6-Micron Mylar Diaphragm
  • TAB-Funkenwerk (AMI) Output Transformer
The Warm Audio WA-47 is a large-diaphragm tube condenser microphone designed to provide the tonal characteristics of classic U47 microphones for vocalists, musicians, and recording engineers in home, project, and commercial recording studios. Thanks to nine polar patterns—cardioid, omnidirectional, figure-8, and six intermediate patterns—selectable from the included external power supply, its versatility allows it to excel at anything from close-up vocals to distant room sounds.

The K47-style capsule reproduction features dual gold-sputtered, 6-micron Mylar diaphragms with a single backplate. Tone-enhancing components, including a JJ 5751 vacuum tube, TAB-Funkenwerk (AMI) output transformer, and WIMA, Solen, and polystyrene capacitors, have been carefully selected to impart vintage-flavored tone characterized by a smooth, uncompressed high end and strong, warm low frequencies. Even the 7-pin cable, manufactured by Gotham Audio in Switzerland, rises to meet the demands of uncompromised audio production. It ensures the integrity of high frequencies and minimizes phase shift between the microphone and the power supply.

The WA-47 ships with a wood box and a shockmount, which reduces rumble and decouples it from problematic vibrations.

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$899.00
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Warm Audio WA-47 Overview

  • 1Description
  • 2Custom Capsule
  • 3JJ Vacuum Tube
  • 4AMI Transformer
  • 5Premium Cable
  • 6Tone-Impacting Capacitors

The Warm Audio WA-47 is a large-diaphragm tube condenser microphone designed to provide the tonal characteristics of classic U47 microphones for vocalists, musicians, and recording engineers in home, project, and commercial recording studios. Thanks to nine polar patterns—cardioid, omnidirectional, figure-8, and six intermediate patterns—selectable from the included external power supply, its versatility allows it to excel at anything from close-up vocals to distant room sounds.

The K47-style capsule reproduction features dual gold-sputtered, 6-micron Mylar diaphragms with a single backplate. Tone-enhancing components, including a JJ 5751 vacuum tube, TAB-Funkenwerk (AMI) output transformer, and WIMA, Solen, and polystyrene capacitors, have been carefully selected to impart vintage-flavored tone characterized by a smooth, uncompressed high end and strong, warm low frequencies. Even the 7-pin cable, manufactured by Gotham Audio in Switzerland, rises to meet the demands of uncompromised audio production. It ensures the integrity of high frequencies and minimizes phase shift between the microphone and the power supply.

The WA-47 ships with a wood box and a shockmount, which reduces rumble and decouples it from problematic vibrations.

Custom Capsule

The WA-47 utilizes a custom reproduction of the vintage K47-style capsule that was used in the classic U47 microphone—designed with the same hole pattern and frequency response. Warm Audio's version of this capsule (model WA-47-B-80v) is carefully manufactured by an Australian capsule manufacturer whose precision and consistency allows sonic replication of the most important piece of this classic style of microphone.

JJ Vacuum Tube

The JJ 5751 vacuum tube from the Slovak Republic is a lower gain, low-noise tube that forces much of the sonics of the capsule and transformer to be heard more significantly than some higher-gain tubes might allow. After auditioning four different tube brands, the folks at Warm Audio fell in love with the JJ 5751. Its frequency response and tonal contributions are smooth and vintage in nature.

AMI Transformer

The WA-47 utilizes an American-made TAB-Funkenwerk (AMI) USA transformer with imported large-core German laminations. This transformer helps provide the creamy smooth top end and the larger-than-life bottom end one would expect from a U47-style condenser microphone.

Premium Cable

One component of a tube microphone often overlooked is the 7-pin cable that connects the microphone to its power supply. When auditioning the WA-47 and other tube microphones, Warm Audio learned a lot about 7-pin cables and how the shielding and wire gauge can drastically change the sonic characteristics of a tube microphone. Warm Audio partnered with Gotham Audio in Switzerland to use their carefully built, premium 7-pin GAC-7 cable. Using this cable increases top-end presence and the overall size of the recorded image in the stereo field by reducing phase shift and the parasitic effect often found in poorly built cables.

Tone-Impacting Capacitors

The WA-47 uses a polystyrene coupling capacitor for uncompressed top-end response from the capsule. WIMA film capacitors are present throughout and an imported Solen capacitor drives the TAB-Funkenwerk (AMI) USA output transformer.
UPC: 713541493117

Warm Audio WA-47 Specs

Microphone
Sound FieldMono
Operating PrinciplePressure Gradient
CapsuleCondenser
Polar PatternCardioid, Figure-8, Omnidirectional
Pattern SelectionSwitched (Adjustable on Power Supply)
CircuitryTube
PadNone
High-Pass FilterNone
Performance
Frequency Range20 Hz to 20 kHz
Maximum SPL140 dB SPL
Impedance200 Ohms
Load Impedance2 Kilohms
Dynamic Range130 dB A-Weighted
Signal-to-Noise Ratio82 dB A-Weighted
Equivalent Noise Level10 dB A-Weighted
Connectivity
Output Connectors (Analog)1 x XLR 7-Pin (on Mic)
1 x XLR 3-Pin (on Power Supply)
Cable Length16.40' / 5 m
Power
AC Input Power (PSU)115 to 230 VAC, 50 / 60 Hz
Physical
Dimensionsø: 3.54 x L: 10" / ø: 90 x L: 254 mm
Weight9 lb / 4.08 kg
Packaging Info
Package Weight12.75 lb
Box Dimensions (LxWxH)19 x 13.7 x 5.7"
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