But they contained mercury encases in an glass envelope which produced lots of dangerous UV radiation and had to be operated the right way up; not very suitable for automotive used.
Mercury arc valve - Wikipedia, the free encyclopedia
Hero999 Nil - ThunderChild One
Metal rectifiers, no kind of valves at all - used in battery chargers, rectifiers from alternators, TV's, record players, anywhere a rectifier was required. Easily made larger for higher currents, and easily stacked in series for higher voltages.
BTW - have you googled, and checked sites like this one?
https://ludens.cl/Electron/dynareg/dynareg.htm
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