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Posts Tagged ‘tube radio’

An A/B battery replacement for the Zenith TransOceanic H-500 radio with filament regulation

Thursday, January 26th, 2017

KA7OEI built a battery pack to replace the obsolete "A/B" battery for Zenith TransOceanic (ZTO) H-500 and wrote a post on his blog detailing its assembly: There are several things that I decided that this voltage converter should do: Automatically power up and shut down when the radio is turned...

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Posted in hacks | No Comments »

Eight Henry inductors from an old “tube” radio receiver

Tuesday, December 4th, 2012

Kenneth takes apart a few old "tube" radio receivers and finds 8 Henry inductors inside, which is several orders of magnitude more then regular inductors we're accustom to. He proceeds to hook it up to a 10 uF capacitor, and tests the ringing frequency of this LC circuit. This LC...

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Posted in Teardowns | 2 Comments »

Recent Comments

  • Ja: What the keyer do? Sends random morse code or there is some input? If someone can point me to some source to read I would...
  • Sorin: Pleasure of free!
  • hli: Sunday++
  • Max: Jolly good stuff, although the "include 100 W resistors in series with the inputs and outputs" part is quite hilarious until one realizes* they meant...
  • Admir: Me