[Jeffhs]

I have two Zenith radios (K731, C845) with selenium rectifier stacks in the power supply. How long are these rectifiers supposed to last before they fail? My sets were made in the '60s and are still working. Oddly, however, my MJ1035, which was also manufactured in the mid-sixties, has a silicon diode as a low-voltage rectifier. When did Zenith make the switch from seleniums to silicons? Hmmm.


Thanks in advance.