• Year
  • 1935
perfect model
  • Category
  • Audio Amplifier or -mixer
  • Radiomuseum.org ID
  • 31161

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

 Technical Specifications

  • Number of Tubes
  • 4
  • Main principle
  • Audio-Amplification
  • Power type and voltage
  • Storage Battery for all (e.g. for car radios and amateur radios) / 6 Volt
  • Power out
  • 15 W (undistorted)
  • Material
  • Metal case
  • from Radiomuseum.org
  • Model: Acratest - Acratone 47 - Federated Purchaser, Inc.
  • Shape
  • Chassis only or for «building in»
  • Dimensions (WHD)
  • 10 x 5.5 x 8 inch / 254 x 140 x 203 mm
  • Notes
  • Mobile PA amplifier (for mike and phono input)

    Made for mounting in an automobile or sound truck. It had a remote steering column control.

    Overall voltage gain of 80db; frequency response of 40 to 10,000 cps; input impedances of 200 and 500 ohms; and output impedances of 2, 3, 4, 6, 7, 8, 10, 12, 13, 15, and 500 ohms.

    Tube 6B5 is from 1935.

  • Net weight (2.2 lb = 1 kg)
  • 20 lb (20 lb 0 oz) / 9.080 kg
  • Price in first year of sale
  • 49.50 USD
  • External source of data
  • Ernst Erb
  • Circuit diagram reference
  • Rider's Perpetual, Volume 7 = 1936 and before
  • Literature/Schematics (1)
  • 1935 Federated Purchaser catalog page 17.

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