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  2. Tuned radio frequency receiver - Wikipedia

    en.wikipedia.org/wiki/Tuned_radio_frequency_receiver

    Block diagram of TRF receiver. The classic TRF receivers of the 1920s and 30s usually consisted of three sections: one or more tuned RF amplifier stages. These amplify the signal of the desired station to a level sufficient to drive the detector, while rejecting all other signals picked up by the antenna.

  3. Neutrodyne - Wikipedia

    en.wikipedia.org/wiki/Neutrodyne

    The Neutrodyne radio receiver, invented in 1922 by Louis Hazeltine, was a particular type of tuned radio frequency (TRF) receiver, in which the instability-causing inter-electrode capacitance of the triode RF tubes is cancelled out or "neutralized" [1] [2] to prevent parasitic oscillations which caused "squealing" or "howling" noises in the speakers of early radio sets.

  4. Antique radio - Wikipedia

    en.wikipedia.org/wiki/Antique_radio

    The sound quality of antique radios depends on the technologies used in the set. The type of speaker is the main differentiator, with mains or battery also making a significant difference. All valve sets produce 2nd harmonic distortion, which is fairly euphonic. Some also produce significant 3rd harmonic distortion, which is less pleasant to ...

  5. Classic car sales stall in Monterey auctions as new ... - AOL

    www.aol.com/news/classic-car-sales-stall...

    Total sales at this year’s five car auctioneers in Monterey, California — RM Sotheby’s, Broad Arrow, Gooding & Company, Mecum and Bonhams — fell to $391.6 million this year from $403 ...

  6. Radio receiver - Wikipedia

    en.wikipedia.org/wiki/Radio_receiver

    The reflex receiver, invented in 1914 by Wilhelm Schloemilch and Otto von Bronk, [136] and rediscovered and extended to multiple tubes in 1917 by Marius Latour [136] [137] and William H. Priess, was a design used in some inexpensive radios of the 1920s [138] which enjoyed a resurgence in small portable tube radios of the 1930s [139] and again ...

  7. Regenerative circuit - Wikipedia

    en.wikipedia.org/wiki/Regenerative_circuit

    Regenerative receivers require fewer components than other types of receiver circuit, such as the TRF and superheterodyne. The circuit's advantage was that it got much more amplification (gain) out of the expensive vacuum tubes , thus reducing the number of tubes required and therefore the cost of a receiver.

  8. The 10 Most Expensive Cars Heading to Auction at ... - AOL

    www.aol.com/10-most-expensive-cars-heading...

    8. 2002 Ferrari F2001b Formula 1. RM Sotheby’s. Estimate: $8,000,000 – $10,000,000. This chassis, #215, with its roaring Tipo 050 V-10 engine mated to a sequential seven-speed transmission ...

  9. Radio receiver design - Wikipedia

    en.wikipedia.org/wiki/Radio_receiver_design

    The reflex receiver was a design from the early 20th century which consists of a single-stage TRF receiver but which used the same amplifying tube to also amplify the audio signal after it had been detected. This was in an era where each tube was a major cost (and consumer of electrical power) so that a substantial increase in the number of ...

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