• Year
  • 1933
  • Category
  • Audio Amplifier or -mixer
  • Radiomuseum.org ID
  • 53200

Click on the schematic thumbnail to request the schematic as a free document.

 Technical Specifications

  • Number of Tubes
  • 6
  • Main principle
  • Audio-Amplification
  • Power type and voltage
  • Alternating Current supply (AC) / 110 Volt
  • Loudspeaker
  • - For headphones or amp.
  • from Radiomuseum.org
  • Model: D-250 [late] - Electrad Inc.; New York NY
  • Notes
  • employs a '27 driver tube.
  • External source of data
  • Ernst Erb
  • Source of data
  • -- Schematic
  • Circuit diagram reference
  • Rider's Perpetual, Volume 6 = 1935 and before

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