J3S and J3A (1960 to 1970) Previous
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The J3 series of meters was a major redesign introducing a magnetic float suspension similar to the one on the Westinghouse D2S. Also, the retarding magnets were now mounted in the frame itself instead of being bolted to a shelf as on the previous J and J2 models, reducing the side thrust on the bearings. As with other manufacturers at the time, the current coils were now coated with epoxy (replacing enamel and fiberboard laminations). The self-contained J3S (both Class 100 and Class 200 versions) had the same white plastic base as the later J2S. The transformer-rated J3S meter was initially produced in a metal-base version but eventually changed over to use the new plastic base. Most of the J3 meters were produced with a 100:1 gear ratio between the disk and register pickup, but a few were produced with a 50:1 ratio (a precursor to the J4?) and were specially marked on the register. J3S
Photo by Austin International