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They allowed for vastly more complicated systems and gave us radio, television, phonographs, radar, long-distance telephony and much more. They played a leading role in the field of microwave and high power transmission as well as television receivers until the middle of the 1980s. Vacuum tubes are still used in some specialist applications such as high power RF amplifiers, cathode ray tubes, specialist audio equipment, guitar amplifiers and some microwave devices. We suggest that your decision on how to maintain records be based on predicate rule requirements and that you base your decision on a justified and documented risk assessment and a determination of the value of the records over time. This distinction started around 1906 with the invention by Lee De Forest of the triode, which made electrical amplification of weak radio signals and audio signals possible with a non-mechanical device. Until 1950, this field was called "radio technology" because its principal appli

If you're trying to decide what phone and plan are best for you, start by choosing a carrier that covers your local area, then consider their services and the number of minutes you are going to need. Signing up for a fixed-term contract will often get you a great price on a phone, but if you don't want to make that long-term commitment, you might want the flexibility of a prepaid or no-contract phone. You can buy instant prepaid minutes and data at Walmart.com whenever you need them, so you never have to worry about coming up short. These example sentences are selected automatically from various online news sources to reflect current usage of the word 'electronic.' Views expressed in the examples do not represent the opinion of Merriam-Webster or its editors. Circuit analysis is the study of methods of solving generally linear systems for unknown variables such as the voltage at a certain node or the current through a certain branch of a network. The MOSFET was the f