Princeton Applied Research 113 Pre-Amp with HP and LP Filtering

. The 113 Low Noise Preamplifier is a general purpose instrument providing high gain and low noise amplification of signals from dc to 300kHz. Attenuation Slope: 6 dB/octave Rolloffs: Selectable in 1- 3- 10 sequence Low Frequency: DC and 0.03Hz to 1kHz Frequency: 3Hz to 300kHz Max. output voltage of 10 V p-p Output impedance: 600-ohms

Has built-in NiCd batteries, but they needs to be changed.