This struck me as an odd little forgotten corner of circuit design history and I thought HN might appreciate it. From the article: “A wobbulator is an electron

This struck me as an odd little forgotten corner of circuit design history and I thought HN might appreciate it. From the article: “A wobbulator is an electronic device primarily used for the alignment of receiver or transmitter intermediate frequency strips. It is usually used in conjunction with an oscilloscope, to enable a visual representation of a receiver's passband to be seen, hence simplifying alignment; it was used to tune early consumer AM radios. The term "wobbulator" is a portmanteau of wobble and oscillator.”