Gauge Microphones ECM-47
Multi-Pattern Tube Condenser Microphone
The ECM-47 is a large-diaphragm multipattern tube microphone. It is described as having “the warmth of a tube 47 and the presence peak of a C12.”
The mic has a 35mm capsule, with dual 6-micron diaphragms. A switch on the external power supply allows selection of any of 9 pickup patterns, from omni to figure-of-8. The manual warns that “whenever the polar pattern is changed, please allow at least 3-minutes for the change to take full effect.”
The amplifier circuit uses a 6072 vacuum tube and has a transformer-coupled output. The transformer is a dual-bobbin design with a 6.5:1 ratio. (The Neumann BV8 transformer in the U-47 had the same ratio.)
The Gauge quality control program requires that:
- Tubes are tested for gain and noise prior to assembly; if more than 1 in 20 tubes fails, the entire shipment is rejected.
- Capsules are manufactured to higher tolerances than for low-priced mics.
- Mics are burned in for 48 hours prior to shipping from the factory.
- Each mic is individually auditioned in California by Gauge staffmembers.
The ECM-47 ships in a hardwood case with a pop filter, elastic shockmount, tube power supply and power cable, in a flight case.
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The mic was released in 2009.
Specifications
Frequency Response - OmnidirectionalClick Graph to Compare! |
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Frequency Response - CardioidClick Graph to Compare! |
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Frequency Response - BidirectionalClick Graph to Compare! |
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Pickup Patterns | Pads & Filters |
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Omnidirectional
(16 mV/Pa; 20 - 20,000 Hz) Cardioid (16 mV/Pa; 20 - 20,000 Hz) Bidirectional (16 mV/Pa; 20 - 20,000 Hz) |
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Capsule Dimensions | Impedance | SPL/Noise |
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Capsule diameter: 35mm Diaphragm gauge: 6 microns |
200 Ohms (Low) | Max SPL: 135 dB Self-noise: 18.0 dB(A) |
Weight | Length | Max Diameter | Interface(s) |
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n/a | n/a | n/a |
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Power Specifications |
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