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Not sure. Apparently, jeeps & other military vehicles back then put out 24-28VDC instead of the 6-12VDC civilian vehicles did...An R-392 will work w/24VDC, but just not as well...They're roughly similar to the size of a case of 8.5 X 11 office paper, & weigh 55lbs, & have 2 handles on the sides...The ones I've seen can be kinda scuzzy on the outside, but usually look brand-new inside, since they are "sealed"...Most of the tubes are common, but there's one audio tube that's a bit odd...Sometimes they're found w/a SS audio module, but it is virtually identical to the tube in output & fidelity..They're maybe not quite as "good" as a std R-390 or 390A, but, OTOH, I've never really hooked mine up to anything more involved than a length of speaker wire for an antenna...And they DO seem to be somewhat more robust than a 390...I even have the matching transmitter, a T-195.
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Benevolent Despot
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