• Country
• United States of America (USA)

• Manufacturer / Brand
• Federated Purchaser, Inc. (Acratone, Acratest); New York City (NY)

• Year
• 1935

• Category
• Audio Amplifier or -mixer

• Radiomuseum.org ID
• 31161

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

• Number of Tubes
• 4

• Valves / Tubes
• 6A6 6A6 6B5 6B5

• 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

• Source of data
• The Radio Collector's Directory and Price Guide 1921 - 1965

• Circuit diagram reference
• Rider's Perpetual, Volume 7 = 1936 and before

• Literature/Schematics (1)
• 1935 Federated Purchaser catalog page 17.

• Other Models

• Here you find 209 models, 126 with images and 88 with schematics for wireless sets etc. In French: TSF for Télégraphie sans fil.
  All listed radios etc. from Federated Purchaser, Inc. (Acratone, Acratest); New York City (NY)