• Year
  • 1935
  • Category
  • Audio Amplifier or -mixer
  • Radiomuseum.org ID
  • 31174

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

 Technical Specifications

  • Number of Tubes
  • 3
  • Main principle
  • Audio-Amplification
  • Power type and voltage
  • Alternating Current supply (AC)
  • Loudspeaker
  • - For headphones or amp.
  • from Radiomuseum.org
  • Model: Acratest 728 Amp.and Power Supply - Federated Purchaser, Inc.
  • External source of data
  • Ernst Erb
  • Circuit diagram reference
  • Rider's Perpetual, Volume 6 = 1935 and before

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