Bruel & Kjaer Microphone Amplifier 2603

Read the User Guide for the 2603

and the

B & K information for the 2603 and 2604

Below is the circuit diagram for the 2603 click to see a larger version

 See the datasheet for the 2N554 transistor used for providing DC for amplifier valves V1 and V4.

Below is the block diagram of the 2603/2604 which can be used a very accurate RMS voltmeter

 Above a view of the top deck of the 2603 and below the 2604

 Above a view of the bottom deck of the 2603 and below the 2604

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