• Country
• United States of America (USA)

• Manufacturer / Brand
• Radolek Co., Chicago

• Year
• 1936 ?

• Category
• Audio Amplifier or -mixer

• Radiomuseum.org ID
• 52876

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

• Number of Tubes
• 5

• Valves / Tubes
• 24 46 46 46 83

• Main principle
• Audio-Amplification

• Power type and voltage
• Alternating Current supply (AC) / 110 Volt

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

• Power out
• 24 W (unknown quality)

• from Radiomuseum.org
• Model: SR247 - Radolek Co., Chicago

• Notes
• push pull af output stage.

• Circuit diagram reference
• Rider's Perpetual, Volume 8 = 1937 and before

• Author
• Model page created by Peter Rutishauser. See "Data change" for further contributors.

• Other Models

• Here you find 236 models, 118 with images and 63 with schematics for wireless sets etc. In French: TSF for Télégraphie sans fil.
  All listed radios etc. from Radolek Co., Chicago