Vintage Brüel & Kjær Type 1612 Audio Frequency Spectrometer & Band-Pass Filter

A true masterpiece of Danish acoustic engineering. This is an extremely rare, museum-grade Brüel & Kjær Type 1612 Audio Frequency Spectrometer & Band-Pass Filter Set, preserved in its original luxury wooden laboratory housing. IMPORTANT NOTICE: Please contact me BEFORE purchasing to get an accurate shipping quote to your specific location. This is a very heavy, high-value precision laboratory instrument, and shipping costs will vary depending on your country and preferred carrier. This unit features the iconic, large circular rotary frequency selector controls, which are fully intact and operating with satisfying, precise mechanical clicks. Behind the front panel, protected by the internal chassis, lies the original factory information plate listing the comprehensive Weighting Network & Filter modules from ZT 0001 to ZT 0022, preserved in mint, pristine condition. The device is housed in a professional wooden cabinet lined with the original green protective flocking plush, ensuring vibration damping and laboratory-grade shielding. It is built on the original internal black metal chassis with top handles for easy removal, showcasing B&K's legendary industrial design. The front panel is in excellent condition with a vibrant green finish, showing only minor vintage wear or fading to some lettering near the control knobs, which is detailed in the photos. The wooden cabinet is structurally perfect with original factory-milled indents on top for secure stacking. The wood shows light vintage scratches and marks consistent with professional laboratory use, which represents authentic patina rather than damage. Internally, the electronics and passive filter networks are in original, untouched time capsule condition. I have intentionally not cleaned the light internal dust to maintain its historic integrity. I am a specialist in high-end vintage electronics with over 300 five-star reviews. This heavy masterpiece will be shipped using my proven box-in-box heavy-duty packaging system to ensure it arrives safely anywhere in the world. Please note that it is sold as-is due to its vintage, laboratory nature. No cables are included in the set. Please check my other listings for more rare laboratory and Brüel & Kjær equipment