- SR560 Stanford Research PreamplifierCondition: UsedFrequency: 1 MHz
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- SR570 Stanford Research PreamplifierCondition: UsedFrequency: 100 Hz
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- 8447A Agilent PreamplifierCondition: UsedFrequency: 400 Hz
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- 87405A Agilent PreamplifierCondition: UsedFrequency: 3 Hz
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- SR445 Stanford Research PreamplifierCondition: UsedFrequency: 300 Hz
- SR550 Stanford Research PreamplifierCondition: UsedFrequency: 100 Hz
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- 10855A Agilent PreamplifierCondition: UsedFrequency: 1.3 Hz
- 8449A Agilent PreamplifierCondition: UsedFrequency: 22 Hz
- 70620B Agilent PreamplifierCondition: UsedFrequency: 26.5 Hz
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