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    • World War I Radio Gallery
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    • My Atwater Kent Model 5
    • Batt Radio Tubes Gallery
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  • Home
  • Museum Attractions
  • The Collections
  • Radio Gallery 1
  • Radio Gallery 2
  • Radio Gallery 3
  • Radio Gallery 4
  • Speaker Gallery
  • World War I Radio Gallery
  • The Notables
  • Leigh Bassett Wing
  • My Atwater Kent Model 5
  • Batt Radio Tubes Gallery
  • Radio Related Exhibits
  • Schematics/Manuals
  • Other Links
  • Acknowledgements
  • Museum Video Links

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Roaring Twenties Antique Radio Museum

Roaring Twenties Antique Radio Museum Roaring Twenties Antique Radio Museum Roaring Twenties Antique Radio Museum

Radio Gallery 4

HR Amplifier (1921) Clapp-Eastham Co. , Cambridge Mass.

The Very First

The HR is a tuned-radio-frequency or TRF receiver with regeneration. Clapp-Eastham Company, the first radio parts company in the United States, first sold it in 1921. 

Tight Fit

The HR had a very compact design and used a UV-201, one amp tube. 

Tuning Range

The tuning range of 175-825 meters translates into 1713-363 kilohertz. Find out more about the history of the Clapp-Eastham Company by watching the mini-documentary on our YouTube channel. 

 Here's the link -

 https://www.youtube.com/watch?v=Zu0UVUok0Po

HZ Amplifier (1922) Clapp-Eastham Co. , Cambridge Mass.

Early Two-Stage Amplifier

The Clapp-Eastham Company was the first radio parts  company in the United States. The company was founded in 1906.

Unique Design

Two interesting details about the HZ's design are the knife switches on the control panel and the round transformers located underneath the tube sockets. The HZ was designed to use two UV-201, one amp tubes.

HR Companion

Clapp- Eastham built the HZ to be used with the company's HR receiver, which came out earlier. Find out more about the Clapp-Eastham Company by watching the mini-documentary on the museum's YouTube channel, just click on the link - https://www.youtube.com/watch?v=Zu0UVUok0Po

This gallery under construction, more exhibits to come!

  • Home
  • Museum Attractions
  • The Collections
  • Radio Gallery 1
  • Radio Gallery 2
  • Radio Gallery 3
  • Radio Gallery 4
  • World War I Radio Gallery
  • The Notables
  • Leigh Bassett Wing
  • My Atwater Kent Model 5
  • Batt Radio Tubes Gallery
  • Radio Related Exhibits
  • Schematics/Manuals
  • Other Links
  • Acknowledgements
  • Museum Video Links

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