Brühl & Kjoer 2604 Microphone Amplifier

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The Brühl & Kjoer 2604 is an amplifier for microphones and a measuring device for measuring low-frequency signals. 

The 2606 Amplifier has the following values for RMS (Root Mean Square Value), Peak and Average: 0.1 mV to 1000 V, -100 dB to +40 dB, filter A, B or C weighting. It has a 220 V alternating current supply. The following tubes are installed: ECC81, ECC83, EF94, ECF82, EZ90, OA2, OB2.