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.
to other television manufacturers (Air King, Crosley, Fada, et al.) for production under their brand names.
The Wobbulator generator, designated model 1200A, combined sweep and marker functions into a single self-contained pushbutton controlled device which, when connected to an oscilloscope and television receiver under test, would display a representation of the receiver's RF/IF response curves with "markers" defining critical frequency reference points as a response curve on the oscilloscope screen.
The purpose of the modulation was in acoustic characterisation of architectural spaces, where it prevented the build-up of resonances during measurement.