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Collins actually made very few R-390As, only in the early 1955 contracts, & then no more. They DID make quite a few of the earlier R-390s, though. But if you run across an R-389, or an R-391, they made ALL of those. There were, however, only 750 or so R-389s, & about 1300 R-391s made. The R-389 receives from 15 to 1500KC, & the R-391 is nothing but a std R-390 w/an Autotune mechanism. There was also an R-392, a Jeep-mounted version of the R-390, that works on 28 VDC. They get kinda warm in use, are in an unventilated waterproof case, makes a dandy warm-yer-buns campstool...
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Benevolent Despot
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12-23-2007, 02:25 PM
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