RF Cafe Software
About RF Cafe
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.
My Hobby Website:
Try Using SEARCH
to Find What You Need.
There are 1,000s of Pages Indexed on RF Cafe !
October 1953 QST
By 1953, General Electric had already been in business for 75 years, according to this full-page advertisement that ran in the American Radio Relay League's (ARRL) QST magazine. It highlights a few key electronics-related accomplishments by the company since its founder, Thomas Edison, in 1883 built the first electronic tube as the result of a discovery that came to be termed the "Edison effect."
75 Years Old This Month, General Electric Has Written Tube History With a Long Series of "Firsts"!
1883 - First electronic tube was built by Thomas A. Edison, a founder of G. E., in connection with his discovery of what was termed the "Edison effect."
1913 - High-vacuum, high-voltage tube was developed, and work was begun on thoriated filaments.
1915 - G-E tube research, toward modulating h-f for radio voice transmission, resulted in the design and construction of a successful phone transmitter operated from a-c.
1918 - Quantity tube production. Over 100,000 radio vacuum rubes were built by G. E. for the U. S. Army and Navy.
1923 - Superheterodyne circuit was announced. This remains the basis of modern radio reception.
1925 - First special-purpose tube for loudspeaker operation was developed by G. E. (Type UX-120). Glow tubes were introduced for voltage regulation, and rectifier tubes made for radio receivers.
1927 - Screen-grid tube, for r-f amplification.
1942 - Lighthouse tube, for radar and u-h-f communications.
1951 - Ceramic u-h-f power-amplifier tubes were introduced commercially.
* * *
These and many other primary G-E developments - continued over the long history of ham radio - have helped build a unity of interests with amateurs. G. E. gratefully acknowledges the debt which the electronic industry owes to forward-thinking amateurs, and invites them to share in the dedication of G.E.'s 75th birthday to the promise of still greater progress to come.
Posted November 2, 2016