My CB loving Uncle had one with tubes to spare. He'd been a TV repair man in the 50's and 60's and had all kinds of tubes. He got the Swan when his Heathkit 101 gave up the ghost. He had to have that SSB option, "It gives you a buncha extra channels!", he told me when SSB made it's appearance in the CB world in the very early 70's. Both radio's FM'ed like crazy, so he got that option w/o knowing it.
The Swan was in his bedroom when he died in 2006.