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The 12AU7, on the other hand, is described as an "A.F. double triode". [3] Data sheets suggest an upper frequency limit of 30 kHz for the 12AU7/ECC82 and it is not described as a "special quality" device. [4] This contrasts with the 6AB4/EC92 and 12AT7/ECC81 which are both R.F. devices operating up to VHF.
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GE continued refining this system, up until 1978, which marked the end of production of vacuum tube type television receivers. GE produced the basic Porta-Color design well into the 1970s, even after most companies had moved to solid state designs when transistors with the required power capabilities were introduced. The Porta Color II was ...
GE and its products are part of the American iconography. Its founder was Thomas Edison, one of America's foremost thinkers, inventors, and tinkerers. His invention of the light bulb in 1876 ...
Two weeks later, the company announced its plans to buy Lightech, acquiring its LED and halogen power supplies, for a deal reportedly worth between $15 million and $20 million. [8] On October 7, 2015, the Commercial division of GE Lighting was separated from the business and a new startup, Current, was created. [9]
The Dash 8 Series is a line of diesel-electric freight locomotives built by GE Transportation. It replaced the Dash 7 Series in the mid-1980s, and was superseded by the Dash 9 Series for freight usage and the Genesis Series for passenger usage in the mid-1990s.
It also within the first 5 months secured the world's largest LED installation with JPMorgan Chase. [10] Under the deal, Current will replace 1.4 million existing lights at 5,000 of JPMorgan Chase's bank branches with LED lighting. The replacement is expected to reduce the lighting-related energy used at these branches by 50 percent. [12]
The parenthetical values in bold were not part of the original table; they show the equivalent guide number for each aperture-distance combination. [ note 14 ] Note the scatter in the guide number values in each column; the data for the right-most flashbulb setup has over a three-quarter f‑stop variation from high to low.