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CardioidPearl Microphone Laboratory CT 40

Cardioid Tube Condenser Microphone

The CT 40 is a fixed-cardioid tube condenser microphone using Pearl’s trademark rectangular capsule.

Some disparity exists in the published specifications; the website claims a sensitivity of 28 mV/Pa, whereas a brochure gives a figure of 32 mV/Pa. Either way, this is among the more sensitive condensers we have seen.

The Model 2800 capsule is a dual-diaphragm model, using a diaphragm made of thin polyester metallized with vaporized aluminum. The membrane measures 14mm x 29mm, in a housing just slightly larger (17mm x 35mm). The membrane surface area is therefore 406 mm2, about 18% smaller than a typical “large-diaphragm” circular-capsule membrane (whose surface area measures 490mm).

Read more about the characteristics of rectangular diaphragm condenser capsules.

The amplifier circuit uses a Nuvistor tube. The output circuit is transformer-coupled.

The CT 40 ships with a dual-voltage power supply (model C4020), 10m 6-pin cable, elastic shockmount (model 1942), and a flight case.

The Pearl Microphone Laboratory CT 40 is also known as: CT40.

The mic was released in 2003.


Pickup Patterns Pads & Filters
Cardioid (32 mV/Pa; 20 - 25,000 Hz)
Capsule Dimensions Impedance SPL/Noise
Diaphragm diameter: 14mm
Capsule diameter: 29mm
100 Ohms (Low) Self-noise: 15.0 dB(A)
Weight Length Max Diameter Interface(s)
470g (16.58oz) 160mm (6.30'') 43mm (1.69'')
  • 3-pin XLR male (1)
Power Specifications
  • Includes tube power supply

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