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CardioidSterling Audio ST55 FET

Cardioid Condenser Microphone

The Sterling Audio ST55 FET appears to be a reincarnation of the Groove Tubes GT55.

Both are fixed-cardioid solid-state condenser microphones with the 32mm “disk resonator” capsule pioneered by GT founder Aspen Pittman. The capsule in both mics uses a 3-micron diaphragm.

Both have very high sensitivity of 32mV/Pa, and high self-noise of 22dBA. Most modern FET condenser have much lower self-noise (4dBA being extraordinary, 12–16dBA being common).

Both mics use custom-wound, nickel-core output transformers, built into nickel-plated brass bodies with a painted black finish and chrome trim.

Two switches below the headbasket independently enable the pad (-10dB) and high-pass filter (-12dB/octave @ 75Hz).

The mic includes a hardmount (Sterling p/n HM2) and zippered storage case. A shockmount (p/n SM4) is available separately.

Permalink: Sterling Audio ST55

The mic was released in 2007.


Pickup Patterns Pads & Filters
Cardioid (32 mV/Pa; 20 - 20,000 Hz)
  • Pad: -10dB (Via Switch)
  • Filter: HPF: -12dB/octave @ 75Hz (Via Switch)
Capsule Dimensions Impedance SPL/Noise
Diaphragm diameter: 26mm
Capsule diameter: 32mm
Diaphragm gauge: 3 microns
200 Ohms (Low) Max SPL: 144 dB
Self-noise: 22.0 dB(A)
Weight Length Max Diameter Interface(s)
544g (19.19oz) 190mm (7.48'') 46mm (1.81'')
  • 3-pin XLR male (1)
Power Specifications
  • Requires phantom power
  • Phantom voltage: 48v

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