June 1959 Popular Electronics
Table of Contents
Wax nostalgic about and learn from the history of early electronics. See articles
published October 1954 - April 1985. All copyrights are hereby acknowledged.
Have you ever heard of a "nuvistor?" I'm
not sure whether I had prior to reading this article from the June 1959 issue of Popular Electronics. If I ever used one, I didn't know about it. There is an
entry in Wikipedia for the nuvistor. It was supposed to be a real
paradigm changer, but alas, that never happened. RCA could have made billions
off the concept. The other subject of this article on miniaturization,
micro-modules, definitely did gain huge popularity. They are ubiquitous today in
the form of multifunction hybrid modules, plug-and-play system elements, mixed
signal ICs with stacked die, etc. A nuvistor was used in the front end of the
HP3400A True RMS Voltmeter (thanks to Michael M. for that).
Also, thanks to Bob Davis for pointing out that the Lafayette
HB-400 CB radio sported a Nuvistor in the receiver front end.
Here is a Nuvistor
info resource. See the "Nuvistors and Micro-Modules," "The NASA 136,"
Hitachi Nuvistor Advertisement, too.
Nuvistors and Micro-Modules:
Three Nuvistors are shown beside their larger glass tube counterparts.
Left to right are developmental samples of a triode, tetrode, and beam power tube.
Nuvistors outperform conventional types and make possible smaller, more efficient
New developments in miniaturization
Two developments which could shape the future of the electronics industry were
recently announced by the Radio Corporation of America. One, a new type of vacuum
tube called the "Nuvistor," comes from the laboratories of the RCA Electron Tube
Division. The second, a new technique of integrating electronic circuits into "micro-modules,"
was engineered by RCA under a contract with the U. S. Army Signal Corps.
A new concept in tube design, the Nuvistor is
notable for several reasons. Roughly one-third the size of conventional tubes which
perform similar functions, it employs a unique cylindrical type of construction
which is ideally suited for mass production techniques. Materials used are ceramics,
steel, molybdenum, and tungsten. The Nuvistor uses no glass or mica in its construction.
Electrodes are supported from one end in a cantilever fashion. This feature eliminates
the need for mica support discs or spacers. Because of the low mass and shape of
the electrodes, Nuvistors can withstand a high degree of shock and vibration.
Tiny military radio has been made smaller than an average lump
of sugar through the use of micro-module techniques.
Advantages claimed are miniaturization, improved ruggedness, reliability, efficiency,
and lower power drain. Nuvistors operate satisfactorily at temperatures in excess
of those possible with conventional tubes. Another interesting feature is the inclusion
of indexing lugs to Simplify insertion into tube sockets.
It is expected that Nuvistors will be useful in industrial, military, and entertainment
applications. Limited production will start next year. Future refinements include
the possibility of incorporating the cold cathode design now under development by
Tung Sol and the Signal Corps (see POPULAR ELECTRONICS, May, 1959).
Developed primarily for military applications,
micro-modules are nevertheless expected to find their way into industrial and entertainment
equipment. Seemingly the end step in the trend toward miniaturization, they are
composed of tiny wafers one-hundredth of an inch thick and a third of an inch square.
These wafers, each of which is an electronic circuit component such as a resistor,
capacitor, transistor, etc., are stacked, interconnected, and encased in a protective
The use of micro-modules makes possible no less than a tenfold reduction in size
and weight of electronic devices. Tests indicate that the tiny cubes should be highly
dependable, require little power, and provide high performance. It is expected that
mass production techniques will lower their cost sufficiently to justify a "take-out-and-throw-away"
Micro-modules developed to date have all employed transistors. There is no reason,
however, say RCA spokesmen, why they could not be combined with vacuum tubes, or
Nuvistors, to offer functions not provided by transistorized circuits.
Posted November 1, 2022
(updated from original post on 9/25/2011)