In article
,
terry wrote:
Sounds right. But as not in this posting, do recall at least one 12
volt European car radio of the 1950s that had a polarity plug that had
to be placed in the correct position. But reading this now can't think
why that was necessary! Maybe they were synchronous vibrators or
something.

Wonder when transistors started to be used? Hybrid sets were certainly
around in the early '60s.

--
*I'm pretty sure that sex is better than logic, but I can't prove it.

Dave Plowman London SW
To e-mail, change noise into sound.