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Well, here's what my Fred Osterman "Shortwave Receivers:Past & Present"-the "Bible" of this stuff- has to say...S-53-1948-1950, scarce, 8 tubes, was about $80 when new. The S-53A was made from 1951-57, is fairly common, & was about $90 when new. Doesn't look like there's any real difference...
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Benevolent Despot
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