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Click to enlargeThe G.R.A.S. ¼" Preamplifier Type 26AS is for acoustic measurements using condenser microphones.

It is a small robust unit short enough for use in confined spaces, e.g. for binaural measurements with the KEMAR Manikin Type 45BA or the Hearing-protector Test Fixture Type 45CA.

It has a very low inherent-noise level, a wide dynamic range and a frequency response from below 2 Hz to above 200 kHz.

Like all G.R.A.S. microphone preamplifiers, it is based on a small ceramic thick-film substrate with a very high input impedance. The casing is made of stainless steel for maximum strength and durability. Its small dimensions ensure reliable operation under humid conditions owing to the heat generated by internal power dissipation.

The Type 26AS is provided with a 3 m lightweight cable terminating in a 7-pin LEMO series 1B plug. The cable is only 2.5 mm in diameter and will withstand temperatures from –40 ºC to +150 ºC. An adaptor GR0010 for G.R.A.S. ½" microphones is included.

Download PDF Data Sheet: pd_26AS_ver_10_June_09.PDF

Related Products:

Type 26A+ Series, Types 26HG, & 26TC
Types 26CB & 26CC

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Click to enlargeThe G.R.A.S. ¼" Preamplifier Type 26AR is for acoustic measurements using condenser microphones.

It has a very low inherent-noise level, a wide dynamic range and a frequency response from below 2 Hz to above 200 kHz.

Like all G.R.A.S. microphone preamplifiers, it is based on a small ceramic thick-film substrate with a very high input impedance. The casing is made of stainless steel for maximum strength and durability. Its small dimensions ensure reliable operation under humid conditions owing to the heat generated by internal power dissipation.

Download PDF Data Sheet: pd_26AR_ver_30_June_09.PDF

 Type 26AR is supplied with a 3-m light-weight cable (AA0057). Its 4-pin LEMO plug connects to the preamplifier and its 7-pin LEMO (Fig. 2) to a power module. The cable is only 2.5 mm in diameter and will withstand temperatures from –40 oC to +150 oC. An adapter GR0010 for G.R.A.S. ½″ microphones is included.

Related Products:

Type 26A+ Series, Types 26HG, & 26TC
Types 26CB & 26CC

Adobe Acrobat reader is required for viewing data sheets.

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Specifications Type 26AS

Frequency range: 2 Hz - 200 kHz (±0.2 dB)
Input impedance: 0.4 pF, 20 G Ohm
Output impedance: 55 Ohm (typical)
Output connector: 7-pin LEMO male
Power supply, Single: 28 V, 0.7 mA to 120 V, 2.5 mA
and Dual: ±14 V, 0.7 mA to ±60 V, 2.5 mA
Noise, A-weighted and: ≤ 4 µV
Linear (20 Hz - 20 kHz): ≤ 10 µV rms 
Gain: –0.25 dB (typical)
Operating temperature: –30 °C to + 70 °C
Storage temperature: –40 °C to + 85 °C
Dimensions (ex cable): diameter: 6.35 mm (¼")
length: 28.65 mm
Weight (inc. cable): 47 g



Specifications Type 26AR

Frequency range: 2 Hz - 200 kHz (±0.2 dB)
Input impedance: 0.4 pF, 20 G Ohm
Output impedance: 55 Ohm (typical)
Output connector: 7-pin LEMO male
Power supply, Single: 28 V, 0.7 mA to 120 V, 2.5 mA
and Dual: ±14 V, 0.7 mA to ±60 V, 2.5 mA
Noise, A-weighted and: ≤ 4 µV
Linear (20 Hz - 20 kHz): ≤ 10 µV rms 
Gain: –0.25 dB (typical)
Operating temperature: –30 °C to + 70 °C
Storage temperature: –40 °C to + 85 °C
Dimensions and weight (ex cable): diameter: 6.35 mm (¼")
length: 28.65 mm
weight: 4 g
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Updated 30. june 2009

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