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March 1944 Radio-Craft
 [Table
of Contents]
Wax nostalgic about and learn from the history of early electronics.
See articles from Radio-Craft,
published 1929 - 1953. All copyrights are hereby acknowledged.
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"Necessity is the mother of
invention," is an oft-heard maxim that is validated continually. Such was the
case, as pointed out here in this National Union Radio Corporation ad which
appeared in a 1944 issue of Radio-Craft magazine. The development of
many new metal alloys was required in order to obtain the kind of performance
and reliability needed in ever-evolving electronics products. Already available
metals for filaments, coils, grid wires, getters, electron guns and many other
constituents of vacuum tubes that are subject to high temperatures (many hundreds
of degrees) and mechanical conditions (unequal coefficients of expansion, for
example, which can cause stress fractures), were not sufficient for the task.
Metallurgists had their work cut out for them, but succeeded magnificently,
as evidenced by the plethora of new tubes being introduced each year.
National Union Radio Corporation Ad
 Metal Magic!
Long ago National Union engineers had to strike out for themselves in search
of new metals, alloys and coatings. The extremely high temperatures employed
in tube making - brazing, for example, at 2 to 5 times the heat customarily
used - ruled out the use of metals common to most industries.
For this reason and for others peculiar to the needs of tube manufacture,
there has come from the nation's electronic tube laboratories a whole new group
of metals and combinations of metals. Here are special alloys for filaments,
coils, grid wires, getters, electron guns and many other uses. And as these
metals have provided characteristics not previously available, they have literally
pulled wonders out of the magic hat of electronics.
In metallurgy, as in other sciences related to tube making, National Union
is helping to push back the frontiers of electronic knowledge. This research
is helping, also, to provide for service engineers a broad, profitable post-war
franchise. Count on N. U. to be ready with better tubes for every important
service need.
National Union Radio Corporation, Newark, N.J.
Factories: Newark and Maplewood, N. J., Lansdale and Robesonia, Pa.
National Union
Radio and Electronic Tubes
Transmitting, Cathode Ray, Receiving, Special Purpose Tubes • Condensers •
Volume Controls • Photo Electric Cells • Panel Lamps • Flashlight
Bulbs
Posted January 18, 2021
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