2 Selenium rectifier trade names of the right sort of specs, of the early
1950s, were
Westinghouse Westalite
and
STC SenTerCel
for which the earliest reference I've found is 1951


--
Diverse Devices, Southampton, England
electronic hints and repair briefs , schematics/manuals list on
http://home.graffiti.net/diverse:graffiti.net/