• Country
• United States of America (USA)

• Manufacturer / Brand
• Signal Electric Mfg. Co.; Menominee (MI)

• Year
• 1921 ?

• Category
• Audio Amplifier or -mixer

• Radiomuseum.org ID
• 210841

• Number of Tubes
• 1

• Valves / Tubes
• VT-Class-II or A_Moorhead or UV201

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

• Wave bands
• - without

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

• Loudspeaker
• - For headphones or amp.

• Material
• Wooden case

• from Radiomuseum.org
• Model: One Stage Audio Amplifier No. 81 - Signal Electric Mfg. Co.;

• Shape
• Tablemodel, Box - most often with Lid (NOT slant panel).

• Dimensions (WHD)
• 6.25 x 6.125 x 5 inch / 159 x 156 x 127 mm

• Notes
• Signal Electric Manufacturing Co. No. R-81 One Stage Audio Amplifier.

• Literature/Schematics (1)
• Signal Electric Manufacturing Co. High Class Wireless Apparatus brochure

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

• Other Models

• Here you find 34 models, 33 with images and 1 with schematics for wireless sets etc. In French: TSF for Télégraphie sans fil.
  All listed radios etc. from Signal Electric Mfg. Co.; Menominee (MI)