Yahoo Web Search

  1. Project: A Simple One Valve Regenerative Receiver

    Introduction. This is a simple one-valve radio for AM reception from approximately 500kHz to 1.8MHz. It should be possible to build it over a weekend and it doesn't ...

  2. Be that as it may, the "Beginner's One-Valve Set" included (with other popular BOP designs) in Gilbert Davey's first book, Fun with Radio, published in October 1957, is clearly descended from the 1948 design.

  3. One valve radio - YouTube

    This is a one valve [tube] radio that believe it or not I constructed 48 years ago. It remained lost but was discovered again during a recent house move. The valve used is a battery R.F. pentode ...

  4. Vintage Circuit Archive - Vintage Radio and Electronics

    Last Update 28 Apr 2008 Radio Constructors Circuit Archive Valve TRF All pages open in new windows. Please turn off any Pop Up stoppers.

    • One valve radio
    • Lizard valve radio kit
    • Vintage valve radio scrap Bluetooth DAB conversion
    • crystal 5
  5. Switch on subtitles for more information In electronics, a vacuum tube, electron tube (in North America), thermionic valve, tube, or valve is a device controlling electric current through a vacuum ...

  6. Restored British Vintage Radios For Sale

    1945 Pye 15A (valve) The 15A was one of the first British domestic radios to be produced after the end of world war two. Certainly it was the first domestic Pye radio ...

  7. UK Vintage Radio Repair and Restoration - Audio Output Stages

    Audio Output Stages . The vast majority of sets will use a Class A output stage, with a single valve driving the output transformer. The output valve is normally a ...

  8. Silicon Chip Online - Vintage Radio

    An audio step-down transformer was used to couple between the valve and the low-impedance headphone, a cheap single earpiece unit. It had a metal band that went over ...

  9. A Simple Radio Receiver - University of Cambridge

    The amplitude of the transmitted radio signal or carrier is modulated - made to rise and fall - by another signal of audible frequency - for example, speech or music. The receiver must extract or detect this audio signal by separating it from the carrier.

  10. Negative voltage rails are useful for both fixed bias configurations and also switching off individual stages, a technique often used for T/R switching in valve radio transceivers. I decided that 6.3V AC, 12V, 150V, 300V and -130V DC would cover most applications and could be accommodated in a small case using the parts I had.