• Country
• United States of America (USA)

• Manufacturer / Brand
• Keystone Radio Co.

• Year
• 1921

• Category
• Audio Amplifier or -mixer

• Radiomuseum.org ID
• 230603

• • Brand: Wondertone

• Number of Tubes
• 1

• Valves / Tubes
• UV201

• Main principle
• Audio-Amplification; 1 AF stage(s)

• Wave bands
• - without

• Power type and voltage
• Storage and/or dry batteries

• Loudspeaker
• - This model requires external speaker(s).

• Material
• Various materials

• from Radiomuseum.org
• Model: One-Step Audio Amplifier Panel - Keystone Radio Co.

• Shape
• Tablemodel, with any shape - general.

• Dimensions (WHD)
• 4 x 6.5 x 0 inch / 102 x 165 x 0 mm

• Price in first year of sale
• 12.25 USD

• Literature/Schematics (1)
• February 1921 Pacific Radio News magazine advertisement page 233

• Author
• Model page created by Alan Larsen. See "Data change" for further contributors.

• Other Models

• Here you find 7 models, 3 with images and 0 with schematics for wireless sets etc. In French: TSF for Télégraphie sans fil.
  All listed radios etc. from Keystone Radio Co.