On Thursday, August 6, 2015 at 5:21:25 PM UTC-5, micky wrote:

Maybe you were thinking about the diodes in the alternator**. If they
had had to depend on diode tubes, whether glass or metal, instead of
semi-conductor diodes, I don't think alternators would have been
possible.


My dad's radio in his '60 Caddy had tubes...great sound for the time.