

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 | ||||||
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Pads & Filters | Impedance | SPL/Noise |
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200 Ohms (Low) | Max SPL: 145 dB |
Weight | Length | Max Diameter | Interface(s) |
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400g (14.11oz) | 19mm (0.75'') | 21mm (0.83'') |
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Power Specifications |
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