General Radio 1232A

The 1232A Tuned Amplifier and Null Detector is a battery operated, solid-state amplifier which excels in common applications and fits many unusual requirements with its combined high sensitivity, low noise, choice of narrow or broad bandwidth, high gain, and portability. Frequency Response: Tunable Filters - 20Hz to 20kHz in three ranges; 50kHz and 100 kHz Filters Sensitivity: 0.1 V Bandwidth: Approximately 5% Gain: 120 dB