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  2. Tuned radio frequency receiver - Wikipedia

    en.wikipedia.org/wiki/Tuned_radio_frequency_receiver

    This 1920s TRF radio manufactured by Signal is constructed on a breadboard Tuning a TRF receiver, like this 5 tube Neutrodyne set from 1924 with two stages of RF amplification, was a complicated process. The three tuned circuits, controlled by the 3 large knobs, had to be tuned in unison to the new station.

  3. List of Texas area codes - Wikipedia

    en.wikipedia.org/wiki/List_of_Texas_area_codes

    Numbering plan areas and area codes of Texas (tan). This is a list of area codes in the U.S. state of Texas. The date of establishment of each area code is indicated in parentheses: [1] 210: San Antonio area; overlays with 726 (November 1, 1992) 214: Dallas area, overlays with 469, 972, and 945 (October 1947) 254: Waco, Killeen, Temple, Belton ...

  4. Area codes 210 and 726 - Wikipedia

    en.wikipedia.org/wiki/Area_codes_210_and_726

    Area codes 210 and 726 are telephone area codes in the North American Numbering Plan (NANP) for San Antonio and most of its innermost suburbs in Bexar County in the U.S. state of Texas. The original area code, 210, was created in an area code split from area code 512 in 1992. After only a few years, the threat of number exhaustion forced a ...

  5. 10 Old Tech Gadgets Worth a Pretty Penny Today

    www.aol.com/finance/10-old-tech-gadgets-worth...

    Factory-sealed units have been known to sell for thousands at auctions, with one “exceedingly rare” 4GB model selling for an eye-gouging $190,373 in 2023. Even used ones in good condition can ...

  6. Antique radio - Wikipedia

    en.wikipedia.org/wiki/Antique_radio

    This approach provided high performance with a minimum number of expensive vacuum tubes, but these receivers tended to radiate RF interference in their immediate vicinity. Consequently, there was a significant amount of hostility by neighbors of "regen" set users over maladjusted radios transmitting squealing noises and blocking reception [ d ...

  7. 5 Items From the 1970s That Are Worth a Lot of Money - AOL

    www.aol.com/finance/5-items-1970s-worth-lot...

    This would be why it sold for $204,435 at auction. Obi-Wan Kenobi with Double-Telescoping Lightsaber (1977): This is a rare Star Wars toy and sold at an auction for $76,000 in 2018.

  8. Area codes 214, 469, 972, and 945 - Wikipedia

    en.wikipedia.org/wiki/Area_codes_214,_469,_972...

    Area codes 214, 469, 972, and 945 are telephone area codes in the North American Numbering Plan (NANP) for Dallas, Texas and most of the eastern portion of the Dallas–Fort Worth metroplex The area codes are assigned in an overlay complex to a single numbering plan area that was the core of one of the original area codes of 1947, area code 214.

  9. 30 Scam Phone Numbers To Block and Area Codes To Avoid - AOL

    www.aol.com/19-dangerous-scam-phone-numbers...

    Look at the area code: Start by comparing the phone number’s area code to the list of area codes you should never answer. If it’s on the list, there’s a good chance there’s a scammer on ...

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