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The Fabulous DIY Regenerative Radio

Have you ever seen it before the old-fashioned regenerative radio? Honestly, most of the appearance of older type generative radio is rough and ugly, but it’s has many fascinating functions inside it!

Normally, you’ll find transistor in the modern radio set. However, for this classic regenerative tube radio, it’s impossible to track even a transistor, as it didn’t use it at all!

For your information, the regenerative radio is based on the single type 30 tube. The #30 tube requires two volts to operate the filament. For those who didn’t realize, the type 30 is a triode tube and has three elements: A filament, a grid and plate.


Here’s how the regenerative radio works:

  • Firstly, the electron flow from the filament to the plate with a grid or wire in between.

  • Then, vacuum tube amplifies and controlling the regeneration, or feedback with a tetrode or pentode tube.

When you’re operating the regenerative radio, frequent adjustment of the regeneration control is necessary, especially when tuning the band. In this case, you have to keep the set out of oscillation, since there’s no isolation between the tube and the antenna. As an alternative, you can choose to end up with a miniature transmitter, but you might get complaints from your neighbors, as you’re interrupting their radio’s reception!

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