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The receiver's ultimate design was the result of the analysis of more than 600 requested reports, including input from government engineers.

R-12s were only available from late-1940 up to the beginning of WWII, which accounts for their rarity today.

55 years later, I purchased this SX-28 from W6EYC's son.

I totally rebuilt this SX-28 and the performance is incredible.

The SX-28 would become an all-time ham favorite, famous for incredible audio coupled with amazing sensitivity, stability and selectivity - all at a reasonable selling price.

Shown to the left and below are pages two, three and four of the multi-page advertisement in July 1940 QST that announced the SX-28.