An interesting point about Tungar rectifiers:-
They could "self protect" against quite severe overloads.
I once inadverently shorted the output of the 1930s 6v battery charger I used to charge the battery of my old prewar Chev.
I thought I had "killed" it, but the Tungar glowed brightly with the short on, & returned to normal operation when it was removed.
A silicon, selenium, or copper oxide rectifier would have been toast!
I was having these adventures in the very early 1960s, the car was from 1936, & the charger, a few years older than that!
My old work had a very large Tungar charger which was probably of a similar vintage.