• Year
  • 1925–1928 ?
  • Category
  • Audio Amplifier or -mixer
  • Radiomuseum.org ID
  • 66078

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

 Technical Specifications

  • Number of Tubes
  • 2
  • Main principle
  • Audio-Amplification; 1 AF stage(s)
  • Wave bands
  • - without
  • Power type and voltage
  • Alternating Current supply (AC) / 110 Volt
  • Loudspeaker
  • - For headphones or amp.
  • Material
  • Metal case
  • from Radiomuseum.org
  • Model: 45-A - Western Electric Company Inc.;
  • Shape
  • Tablemodel, Box - most often with Lid (NOT slant panel).
  • Notes
  • The 45A is similar to the 25A plus a built-in +B supply. One 205D acts as an audio amplifier, the other 205D is used as a rectifier for +B. The set has three extra outputs for different +B voltages to supply auxiliary equipment.
  • External source of data
  • Ernst Erb
  • Circuit diagram reference
  • Rider's Perpetual, Volume 1 = 1931/1934 (for 1919-1931)

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