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