Traditional power supply (LEMO)

Traditional power supply (LEMO)

Traditional preamplifiers require an external power supply which delivers a supply voltage of either ±15 to ±60 V DC or +28 to +120 V DC. This type of preamplifier is normally connected to a suitable power supply (for example the G.R.A.S. Type 12AK) via a 7-pin LEMO plug, see diagram below, or to an analyzer with a suitable LEMO connector.
  1. 26AN 1/4'' Insert Voltage Preamp
    Freq range: 2.5 Hz - 200 kHz
    Noise: 1.8 µV
    Gain: -0.29 dB
    Special feature: For open-circuit sensitivity calibration of 1/2" and 1/4" microphone cartridges

    G.R.A.S. 26AN 1/4'' Insert Voltage Preamplifier

    The G.R.A.S. 26AN 1/4" Preamplifier is a small robust unit optimised 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.G.R.A.S. 26AN is configured to permit use of the insert voltage-technique for determining the open-circuit sensitivity of a microphone.

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  2. 26AG 1/2'' Insert Voltage Preamp, Connector
    Freq range: 2.5 Hz - 200 kHz
    Noise: 1.8 µV
    Gain: -0.25 dB
    Special feature: For open-circuit sensitivity calibration of 1/2" microphone cartridges

    G.R.A.S. 26AG 1/2'' Insert Voltage Preamplifier with Integrated Connector

    The G.R.A.S. ½-inch Preamplifiers Types 26AG,26AH, 26AJ, 26AK, 26AM and 26TK are smallrobust units optimised for acoustic measurementsusing condenser microphones. They have a verylow inherent noise level, a wide dynamic range anda frequency response from below 2 Hz to above200 kHz.

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  3. 26AK-S1 1/2'' Standard Preamp, Connector, 40 GΩ
    Freq range: 2.5 Hz to 200 kHz
    Noise: 1.8 µV
    Gain: -0.25 dB
    Special feature: General purpose, 40 GΩ

    G.R.A.S. 26AK-S1 1/2'' Standard Preamplifier with Integrated Connector, 40 GΩ

    The 26AK-S1 is a ½” microphone preamplifier with integrated 7-pin LEMO male connector and 40 GΩ input impedance.

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  4. 26AK 1/2'' Standard Preamp, Connector
    Freq range: 2.5 Hz to 200 kHz
    Noise: 1.8 µV
    Gain: -0.25 dB
    Special feature: General purpose

    G.R.A.S. 26AK 1/2'' Standard Preamplifier with Integrated Connector

    The 26AK is a ½” microphone preamplifier with integrated 7-pin LEMO male connector. The CCP equivalent is G.R.A.S. 26CA.

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  5. 26AA Set 1/4" Preamplifier for Intensity Probes, Cable
    Freq range: 2.5 Hz - 200 kHz
    Noise: 1.8 µV
    Gain: -0.29 dB
    Special feature: For G.R.A.S. intensity probe handles with 4-pin LEMO connectors

    G.R.A.S. 26AA Set 1/4" Preamplifier with Integrated Cable for Intensity Probes

    The 1/4" Preamplifier Set with Integrated Cable for Intensity Probes are two small robust units optimized for acoustic measurements using condenser microphones. The set has a very low inherent noise level, a wide dynamic range and a frequency response from below 2 Hz to above 200 kHz.

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  6. 26AM 1/2'' Standard Preamp, Cable
    Freq range: 2.5 Hz - 200 kHz
    Noise: 1.8 µV
    Gain: -0.25 dB
    Special feature: General purpose

    G.R.A.S. 26AM 1/2'' Standard Preamplifier with 3 m integrated cable

    The G.R.A.S. ½-inch Preamplifiers Types 26AG,26AH, 26AJ, 26AK, 26AM and 26TK are small robust units optimised for acoustic measurements using condenser microphones. They have a very low inherent noise level, a wide dynamic range and a frequency response from below 2 Hz to above 200 kHz.

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  7. 26AJ 1/2'' SysCheck Preamp, Connector
    Freq range: 2.5 Hz - 200 kHz
    Noise: 1.8 µV
    Gain: -0.35 dB
    Special feature: In-situ sensitivity calibration of microphone/preamplifier set

    G.R.A.S. 26AJ 1/2'' SysCheck Preamplifier with integrated connector

    The G.R.A.S. ½-inch Preamplifiers Types 26AG, 26AH, 26AJ, 26AK, 26AM and 26TK are small robust units optimised for acoustic measurements using condenser microphones. They have a very low inherent noise level, a wide dynamic range and a frequency response from below 2 Hz to above 200 kHz. Learn More
  8. 26AH 1/2'' SysCheck Preamp, Cable
    Freq range: 2.5 Hz - 200 kHz
    Noise: 1.8 µV
    Gain: -0.35 dB
    Special feature: In-situ sensitivity calibration of 1/2" microphone/preamplifier set

    G.R.A.S. 26AH 1/2'' SysCheck Preamplifier with 3 m integrated cable

    The G.R.A.S. ½-inch Preamplifiers Types 26AG,26AH, 26AJ, 26AK, 26AM and 26TK are smallrobust units optimised for acoustic measurementsusing condenser microphones. They have a verylow inherent noise level, a wide dynamic range anda frequency response from below 2 Hz to above200 kHz. Learn More
  9. 26AB 1/4''-1/2'' Universal Preamp, Connector
    Freq range: 2.5 Hz - 200 kHz
    Noise: 1.8 µV
    Gain: -0.29 dB
    Special feature: For both 1/2" and 1/4" microphone cartridges

    G.R.A.S. 26AB 1/4''-1/2'' Universal Preamplifier with Integrated Connector

    The G.R.A.S. 26AB 1/4" Preamplifier is a small robust unit optimised for acoustic measurementsusing condenser microphones. It has a very low inherent noise level, a wide dynamic range anda frequency response from below 2 Hz to above 200 kHz.

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  10. 26AR 1/4" Standard Preamp, Mini-connector
    Freq range: 2.5 Hz - 200 kHz
    Noise: 4 µV
    Gain: -0.35 dB
    Special feature: For integration into structures

    G.R.A.S. 26AR 1/4" Standard Preamplifier with Integrated Mini-connector

    The G.R.A.S. 26AR 1/4" Preamplifier is a small robust unit short enough for use in confined spaces. It has a very low inherent-noise level, a wide dynamic range and a frequency response from below 2 Hz to above 200 kHz.

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  11. 26AC 1/4" Standard Preamp, Cable
    Freq range: 2.5 Hz - 200 kHz
    Noise: 1.8 µV
    Gain: -0.29 dB
    Special feature: General purpose

    G.R.A.S. 26AC 1/4" Standard Preamplifier with 3 m Integrated Cable

    The G.R.A.S. 26AC 1/4" Preamplifier is a small robust unit optimised for acoustic measurements using condenser microphones. It has a very low inherent noise level, a wide dynamic range anda frequency response from below 2 Hz to above 200 kHz.

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  12. 26AS 1/4" Standard Preamp, Cable, Very Short
    Freq range: 2.5 Hz - 200 kHz
    Noise: 4 µV
    Gain: -0.29 dB
    Special feature: For confined spaces

    G.R.A.S. 26AS 1/4" Standard Preamplifier with 3 m Integrated Cable, Very Short

    The G.R.A.S. ¼" Preamplifier Type 26AS is a small robust unit short enough for use in confined spaces, e.g. for binaural measurements with the KEMAR Manikin (G.R.A.S. 45BM or G.R.A.S. 45BA) or G.R.A.S. 45CA Hearing-protector Test Fixture. It has a very low inherent-noise level, a wide dynamic range and a frequency response from below 2 Hz to above 200 kHz.

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  13. 26HG 1/4" Preamp, Cable, Low Frequency
    Freq range: 1 Hz to 200 kHz
    Noise: 1.8 µV
    Gain: -0.29 dB
    Special feature: For low frequency applications

    G.R.A.S. 26HG 1/4" Preamplifier with 3 m Integrated Cable, Low Frequency

    The G.R.A.S. ¼″ Preamplifier Type 26HG is a small robust unit optimised for acoustic measurements using condenser microphones. It has a very low inherent noise level, a wide dynamic range and a wide frequency response from below 1 Hz toabove 200 kHz.

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  14. 26AL 1/4" SysCheck Preamp, Cable
    Freq range: 2.5 Hz to 200 kHz
    Noise: 1.8 µV
    Gain: -0.29 dB
    Special feature: In-situ sensitivity calibration of 1/4" microphone/preamplifier set

    G.R.A.S. 26AL 1/4" SysCheck Preamplifier with 3 m integrated cable

    The G.R.A.S. ¼" Preamplifier Type 26AL is a small robust unit optimised for acoustic measurements using condenser microphones. Type 26AL hasa very low inherent noise level, a wide dynamic range and a frequency response from below 2 Hz to above 200 kHz. It is similar to Type 26AC, buth as a built-in SysCheck capability. This enables in-situ checks of the complete measurement chain from microphone to analyser. The SysCheck technique works by modulating the microphone polarisation voltage.

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  15. 26AA 1/4" Preamplifier for Intensity Probes, Cable
    Freq range: 2.5 Hz - 200 kHz
    Noise: 1.8 µV
    Gain: -0.29 dB
    Special feature: For G.R.A.S. intensity probe handles with 4-pin LEMO connectors

    G.R.A.S. 26AA 1/4" Preamplifier with Integrated Cable for Intensity Probes

    The 26AA G.R.A.S. ¼″ Preamplifier is a small robust unit optimized 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.

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