Schematic is on the RadioMuseum site:
TUBE Precision Sound Level Meter 2203 Tube Equipment Bruel & Kjaer
FET Precision Sound Level Meter 2203 FET Equipment Bruel & Kjaer;
TUBE Precision Sound Level Meter 2203 Tube Equipment Bruel & Kjaer
FET Precision Sound Level Meter 2203 FET Equipment Bruel & Kjaer;
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