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Cardioidt.bone SCT 800

Cardioid Tube Condenser Microphone

The t.bone SCT 800 is an inexpensive tube microphone with a fixed Cardioid polar pattern.

Like most such mics, it uses a 32mm K67-style capsule and a circuit very similar to the Apex 460 (albeit without pattern control).

SCT 800 PCBUnlike the Apex 460, the SCT 800 uses a single circuit board. It is a dual-layer board, likely with through-hole plating, which makes desoldering components (for modification) somewhat more difficult. The 12AX7 tube is socketed.

Its published specifications are unusual, if accurate: the mic’s claimed sensitivity is extremely high at 48mV/Pa, and its self-noise is extraordinarily low at 6.5dBA. The high sensitivity gives the mic relatively low headroom; its max SPL is just 112dB (1% THD).

The mic’s nominal polar pattern (measured at 1kHz) is wide cardioid, with no distinct null at 180°.

The mic ships with its power supply, cables, and an elastic shockmount in a padded flightcase.

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The mic was released in 2002.


Pickup Patterns Pads & Filters
Cardioid (48 mV/Pa; 20 - 15,000 Hz)
Capsule Dimensions Impedance SPL/Noise
Diaphragm diameter: 25mm
Capsule diameter: 32mm
165 Ohms (Low) Max SPL: 112 dB
Weight Length Max Diameter Interface(s)
600g (21.16oz) 222mm (8.74'') 55mm (2.17'')
  • 3-pin XLR male (1)
Power Specifications
  • Includes tube power supply

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