Loctal Tubes

[dieseljeep]

Originally Posted by David Roper

Yeah, although almost none did to the same extent. Early Silvertone TVs actually outdo Philco for engineering of circuits to utilize specific loktal tubes rather than merely swapping sockets to use the types that were nothing more than octals on loktal bases (e.g. 7C5=6V6). The earliest postwar GE and Crosley sets used at least one apiece. Sylvania was augmenting 5U4 with 7X6 in its early 1950s sets;
Motorola also continued to used loktals very occasionally on certain runs of certain chassis into the early 1950s.

The Sears set was a source #101, Colonial Radio, which became Sylvania right around that time.
There seemed to be a tube war for a while!
RCA never used loctal tubes! Philco never used metal tubes or tuning eye tubes, Zenith didn't use metal tubes except in a few post-war models.
Zenith seemed to use Sylvania as one of their prime suppliers.
If there was any metal tubes in a pre-war Zenith, they were repairer installed.