Hello PRR!It is a sweep frequency generator plus a 'scope.
It displays the "frequency response" of RF/IF amplifiers.
Say AM radio. Start by injecting 445KC into the IF stage. The sweep runs say +/-15KC, 430KC to 460KC. Ideally the output is flat through the center, with fall-off on both sides. Diddle the IF cans for maximum gain and good symmetry. Check that you have a full +/-5KC of flat response (to +/-8KC for wideband, to +/-3KC for the usual cheap radio). Move to ANT and feed 600KC, then 1500KC, and adjust the RF stages for good gain and little sideband trimming.
On FM you want the discriminator curve symmetrical and kink-free out past +/-150KHz.
On TV you want smooth with small bumps out past 3MHz.
You "can" do this work with a low-geared RF signal generator and a notebook. Sweeping to a CRT is just faster.
Unless this is government work, or somebody has played with the trimmers, you really do not want to start the kind of job which needs a tank-sweep. The factory adjustments generally do not drift enough to matter. All analog radio is going downhill anyway.
FWIW: these things were never common in repair shops. I am sure I have never seen one powered-up.
Hello Albbey!This used to be called a "wobbulator". You may find indications on how to use it by googling it.
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