January 1956 Popular Electronics
Wax nostalgic about and learn from the history of early electronics. See articles
published October 1954 - April 1985. All copyrights are hereby acknowledged.
Something that is always in the forefront of my mind when reading
these articles from vintage American electronics magazines is how most of the products - including even
the smallest components - were made in the United States. When I read vintage British electronics
magazines (e.g., Wireless
World), most of the products were produced in Europe. The technical and manufacturing know-how
was spread throughout the regions of the world where its citizens dreamed up and realized the wonders
that made the modern world. Part of the reason is supply and distribution chains were not as capable
due to communications and transportation limitations. Nowadays, it seems almost nothing is made in the
countries where the products are designed - except in places like China where so much technology has
been exported to there that their people (very smart folks) are now designing and manufacturing their
own products. Consequently, a large portion of the population in the U.S., England, France, Germany,
etc., no longer has the skills to do the job. They don't have any idea how such things are
accomplished since for most (or all) of their lives almost everything they own comes with a "Made in
<China, Vietnam, Myanmar, Chile, etc.>" marked on it. As late as the early 2000s, fairly stringent technology export restrictions still were
in place in order to keep the latest and greatest capability here at home for strategic purposes, but
I would be surprised if anything is off the table anymore.
Expert care, precision equipment, and a dust-free atmosphere
are required in making TV camera tubes
Factory Production of image orthicons - the all-important television camera tube - is under way in
ultra-modern facilities at the General Electric plant, Schenectady, N. Y. Technicians work in nylon
clothes and use hospital-clean glass lathes and punch presses, as well as a variety of electrochemical
equipment, all behind sealed doors in air-filtered rooms.
Precision welding operation joins a 500-wire mesh to the metal ring. The glass bubble,
ring, and wire mesh assembly form a critical part of the finished TV camera tube. Mesh cannot touch
glass bubble. but must remain spaced from it at 0.002·lnch distance.
Technician receives the glass target and wire mesh assembly after every speck of
dust has been removed.
The assembly is inserted into the glass tube which eventually becomes the image orthicon.
Technician lightens setscrews to hold target in correct position.
View of the target is what the assembler sees as she works with thin, 18-inch offset
screwdriver fastening the target assembly in place within the glass tube. One slip of the screwdriver
could shatter the glass membrane. rendering the tube useless. A speck of dust might not show up until
the tube was completed, which would be too late to save the tube.
This million-dollar investment in camera tube manufacturing involves the assembly of 256 parts to
make a single tube. The operation requires exceptionally high dust and lint control standards. In addition,
it calls for handicraft skills comparable to those used by artisans of centuries past.
Heart of the image orthicon is the "target and mesh assembly." Difficult to make and install, it
consists of a perfect copper mesh of 500 wires to the inch. This mesh must be spaced two-thousandths
of an inch from a delicate glass membrane. The membrane, or "target," must be between one-tenth and
two-tenths of a thousandth of an inch thick.
The entire assembly is then inserted into the 13" stem of the tube and. fastened in place with screwdrivers
that are 18" long. This must be accomplished without either breaking the glass or permitting even the
tiniest speck of dust to enter the tube.
Despite the critical nature of this assembly, the General Electric Company is managing to produce
the tubes in quantity. In addition, G. E. is looking forward to mass production of the less expensive
- and less critical - vidicon camera tubes. Expected to be employed in large quantities as closed circuit
television develops in the next five years, their use is anticipated in military, industrial, commercial,
administrative, and home applications.
Fragile section of glass bubble - about 0.0001·inch thick - is carefully placed on
metal ring. It is then sealed to ring in oven to form delicate "target" of an image orthicon.
The critical nature of the work is suggested by signs on the door. A sneeze, cough,
or unsteady nerves here could cost up to a thousand dollars as technician finishes assembly of camera
Posted January 2, 2017