ECN Forum Forums General Topics of the Trade General Discussion Area DC on 1960s

Just another possibility: Are you thinking of radios, TVs etc. which were advertised as AC/DC models?

These were very common up to the 1960s (and into the 1970s for some TV sets). It didn't mean that all the supplies were DC, just that the sets didn't use a mains power transformer and could be run on AC or DC mains supplies.