05-08-2020, 07:37 PM
Zenith and Colonial (Silvertone) both used Loktal tubes heavily. Both companies, along with Philco, had Sylvania as a tube supplier. There was a lot of anti-RCA sentiment when they came out with their metal tubes, and when Sylvania introduced the Loktal tubes a few years later, they were eagerly accepted.
Tim KA3JRT