1996 - 2016
BSEE - KB3UON
RF Cafe began life in 1996 as "RF Tools" in an AOL screen name web space totaling 2 MB. Its primary purpose was to provide me with ready access to commonly needed formulas and reference material while performing my work as an RF system and circuit design engineer. The Internet was still largely an unknown entity at the time and not much was available in the form of WYSIWYG ...
All trademarks, copyrights, patents, and other rights of ownership to images and text used on the RF Cafe website are hereby acknowledged.
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March 1958 Popular ElectronicsTable of Contents
People old and young enjoy waxing nostalgic about and learning some of the history of early electronics. Popular Electronics was published from October 1954 through April 1985. All copyrights are hereby acknowledged. See all articles from Popular Electronics.
Believe it or not, cathode ray tubes (CRTs) are still manufactured for specialty products and for replacement parts. Even with a high level of automation, there are still steps in the manufacturing process that require human handling. A comparison between CRT plants in the USA and Germany show the similarity but distinctly different processes in a Sylvania and Telefunken operations, respectively. The photos shown are from an article in a 1958 edition of Popular Electronics. At the bottom of this page are videos of a modern CRT manufacturing process and a CRT recycling effort. As you will see, properly recycling a CRT is about as manually intensive as manufacturing one (but with no quality control and functionality concerns). I am not sure where the profit is in recycling unless inflation over the 10-20 years since manufacturing makes the value of materials worth the effort. A très cool documentary film on the designing and manufacturing process of RCA Victor television sets is at the very bottom.
U. S. photos taken at Sylvania Electric plant at Seneca Falls N.Y., USA
German photos taken at the Telefunken Company plant at Ulm, Germany
Here is how CRTs are made today (this is not high volume production)
How It's Made: Cathode Ray Tubes (CRTs)
Now, here is how they are properly disposed of after their useful lifetime.
This is an RCA Victor Television Production Plant Documentary - Dig the Test Equipment!
If you take the time to watch this video of the RCA Victor
television development process, you will be impressed with the
amount of engineering that went into those units. By contrast,
a large percentage of the manual design and testing in today's
electronics is done on a computer with simulation programs
(typically NOT in America).
Huge databases of component characteristics data are available
for just about every electrical, mechanical, and chemical parameter
of every type of material. All of this significantly cuts down
on design and development time needed for getting products to
Every capacitor, resistor, inductor, transformer, tube base, connector, cable, and every wire connecting all the parts together had to be installed by hand back in the era. The same goes for mechanical assemblies. There were no automated test protocols for checking accelerated lifetimes and FCC compliance (see the OATS* setup in the video). Documentation was drawn on a drafting board with a pencil and typed on paper with typewriters. Promotional material and user manuals were laid out on a cutting and lay-up board where text and graphics needed to be brought together. It was a lot of work that kept a huge army of highly skilled engineers, technicians, draftsmen, stylists, and craftsmen employed, many of whom had cut their teeth during the WWII and Korean War defense contracting eras.
America and most other Western countries were powerhouses of intellectual and physical creativity hands-on genius. Nowadays our factories are empty and the national know-how is focused on playing video games and perfecting ways to have the government give you other people's hard-earned stuff.
* OATS = Open Air Test Site for RF testing