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ONLY ONE WAS NECESSARY.  IT WASNT LONG BEFORE PRODUCT DETECTORS ALLOWED AGC
USE WITH BFO, AND SELECTABLE SIDEBAND CAPABILITY WAS INCLUDED.  OLDER
RECEIVERS QUICKLY BECAME OBSOLETE IN FAVOR OF THOSE EQUIPPED WITH PRODUCT
DETECTORS.  BY THE TIME THE HRO 60 WAS DISCONTINUED IN 1964, THE PRICE HAD
RISEN TO 750.  IT WAS REPLACED BY THE SOLID STATE HRO 500 AT A PRICE OF
1,300.  THE TRANSITION TO SSB AS THE PRIMARY MODE OF AMATEUR PHONE
COMMUNICATION WAS IN FULL SWING BY THAT TIME.  SIGNIFICANTLY SMALLER
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