Type 26CF

Type 26CF
The G.R.A.S. ½-inch Preamplifier Type 26CF is for connection to G.R.A.S. CCP1 input channels, e.g. see Type 12AL. It has a standard BNC output connector and is for use with prepolarised microphones. It is delivered without a cable.
It also has two flush-mounted switches for selecting various combinations of gain and filtering, i.e.:
Gain switch settings:
  • 0dB - for normal microphone signals.
  • +20dB - for boosting weak microphone signals.
Filter switch settings:
  • A-Weighting - as required in standard measurements.
  • Linear - to let the microphone signal pass unfiltered.
  • High-pass - to cut off unwanted low frequencies
The Type 26CF can be used with the following ½" G.R.A.S. prepolarised microphones:
  • Type 40AE
  • Type 40AD
  • Type 40AO
  • Type 40AQ
And with the following ¼" G.R.A.S. prepolarised microphones using the Adapter RA0019:
  • Type 40BE
  • Type 40BD
Specifications Type 26CF
Specifications Type 26CF
Frequency range:
2.5 Hz - 200 kHz (±0.2 dB)
Input impedance:
0.4 pF, 20 G Ohm
Output impedance:
< 50 Ohm
Output connector:
Coaxial BNC
Power supply:
4 mA to 20 mA (typically 4 mA)
Noise: A-weighted and:
Typically 10 µV (built-in A-weighted) rms
linear (20 Hz - 20 kHz):
Typically 8 µV rms
–0.25 dB (typical)
Operating temperature:
–30 °C to + 70 °C
Storage temperature:
–40 °C to + 85 °C
diameter: 12.7 mm (½")
length: 92 mm
weight: 30 g
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