GT40

Common name: Groove Tubes GT40

Production Status: Discontinued / Vintage

The GT40 is a medium diaphragm tube condenser microphone. It come with interchangeable omni and cardioid capsules. The circuit is based around a Class A design, a low-noise GT6205M USA vacuum tube and a custom-wound nickel core output transformer. It features a 75 Hz, 12 dB/octave switchable high pass filter and a – 15 dB attenuation pad. Includes hard-mount, shock-mount, case, 25 foot custom low-capacitance microphone cable with Neutrik connectors and PSM power supply unit.

Electrical Characteristics

Frequency Response
20Hz - 20 kHz
Output Sensitivity
mV/Pa
Max SPL
130
Max SPL, THD:
Self Noise (CCIR)
dB
Self Noise (DIN/IEC)
dB-A
Output Impedance
-
Recommended Load
Powering
Proprietary unit
Supply Current
mA
Alternative Powering
Tube Model
6205/EF734
Tube Brand
GT Electronics

Switchable Options

Pad
- 15 dB
Filter/EQ
75 Hz12 dB/octave

Physical Characteristics

Connector
XLR-7M
Connector notes
Available Colours
Weight
Length
Min diameter width
Max diameter
Depth

Accessories

Included
Hard-mount, shock-mount, case, 25 foot custom low-capacitance microphone cable with Neutrik connectors and PSM power supply unit.
Optional