recordinghacks

Groove Tubes GT-44

Detachable-Capsule Pencil Tube Condenser Microphone

The GT-44 is a tube condenser in an end-address, “pencil microphone” form factor. Designed by Aspen Pittman, the mic uses interchangeable 3/4-inch capsules (available in Cardioid, Omni, and Hypercardioid patterns).

The capsules used a 19mm diaphragm made of 6-micron Mylar, vapor-coated with gold, within a 21mm (outside diameter) assembly.

Two switches on the body enabled an optional -15dB pad, or a high-pass filter (cutoff frequency 75Hz). These switches could be operated independently.

The mic’s body is nickel-plated brass.

The GT44 used a two-stage impedance conversion circuit, with a FET on the front end and a subminiature GT6205 pentode afterwards. The mic uses an output transformer.

The GT-44 included its PSM1 power supply and 25-foot cable, both a hard mount and a suspension mount, and a case for the microphone.

The mic was introduced at AES in the Fall of 2001, at an MSRP of $999. In 2004, the company was selling the mic direct for $599.

The Groove Tubes GT-44 is also known as: GT44.

The mic was released in 2001.

Specifications

Compatible Capsules
Groove Tubes C1 Cardioid 19mm Cardioid capsule Sensitivity: 28 mV/Pa CHARTFreq. Resp.: 20 - 20,000 Hz MSRP: $99 | discontinued Groove Tubes C2 Hyper 19mm Hypercardioid capsule Sensitivity: 28 mV/Pa CHARTFreq. Resp.: 20 - 20,000 Hz MSRP: $99 | discontinued Groove Tubes C3 Omni 19mm Omnidirectional capsule Sensitivity: 28 mV/Pa CHARTFreq. Resp.: 20 - 20,000 Hz MSRP: $99 | discontinued

Pads & Filters	Impedance	SPL/Noise
Pad: -15dB (Via Switch) Filter: HPF: -12dB/octave @ 75Hz (Via Switch)	200 Ohms (Low)	Max SPL: 145 dB

Weight	Length	Max Diameter	Interface(s)
400g (14.11oz)	19mm (0.75'')	21mm (0.83'')	3-pin XLR male (1)

Power Specifications
Includes tube power supply

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