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The Perham Collection of Early Electronics

at History San José

  • Welcome to the Perham Collection of Early Electronics at History San José
  • About the Collection
    • Our Volunteers
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      • Online Exhibit
  • Perham History Files
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  • Listen & Watch
  • Bay Area Early Electronics: A Brief History
    • The Dawn of Wireless in the San Francisco Bay Area
    • Radio Into the Air and Across the Oceans
    • “On The Air, Everywhere” — The Growth of Radio and Television Broadcasting
    • Post-War Pioneers
  • People & Companies
    • Lee de Forest
      • De Forest’s Audion tube
      • De Forest “Responder” (electrolytic detector)
      • De Forest RJ4 Detector
      • De Forest Wireless “Everyman” Radio Receiver
    • Eitel-McCullough, Inc. (EIMAC)
    • Harold Elliott
      • 1924 Olympian Clarida Hunsberger, Captured on Film by Harold Elliott
    • Lloyd Espenschied
    • Philo Farnsworth
    • Federal Telegraph Company
      • Federal at Home in Palo Alto
    • William W. Hanscom
    • Ralph Heintz
      • Heintz & Kaufman Gammatron
    • Charles “Doc” Herrold
      • Station KQW equipment
    • Sybil (Herrold) True
    • Jo Jennings
    • Leo Jones
      • Fargo
    • John Kaar
    • The Colin B. Kennedy Company
    • Charles Litton
    • Thorn Mayes
    • Jane Morgan
      • Processing the Jane Morgan Papers
    • Douglas Perham
      • Perham at the Mike
    • Seefred Brothers
    • Royden Thornberg
  • The Technology
    • The Westinghouse “Stopper” Lightbulb
    • Early Wireless and Radio Broadcasting Technology
      • De Forest’s Audion tube
      • De Forest “Responder” (electrolytic detector)
      • De Forest RJ4 Detector
      • De Forest Wireless “Everyman” Radio Receiver
      • Heintz & Kaufman Gammatron
      • Station KQW equipment
      • The Echophone
    • Marine and Mobile Radio
    • High Power and Microwave Technology
      • EIMAC high-power transmitters and klystrons
      • Varian Klystrons
    • Sound Recording & Reproduction
      • Ampex Model 200 prototype reproduce head
      • Hewlett-Packard 200A and 200B Oscillators
    • Surveillance and Counter-Surveillance Technology
      • Cryptext CX-II Data Encryption Device
      • Fargo
    • Computing and Gaming
    • Glossary
      • Vacuum Tubes: Definition
      • Transmitters: Definition
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briefcase_hidden_mike

Hidden microphone

The hidden microphone on the briefcase tag

Posted on September 1, 2015September 1, 2015Full size 640 × 436

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