• Country
• United States of America (USA)

• Manufacturer / Brand
• Radolek Co., Chicago

• Year
• 1933 ?

• Category
• Broadcast Receiver - or past WW2 Tuner

• Radiomuseum.org ID
• 52878

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

• Number of Tubes
• 12

• Valves / Tubes
• 57 56 58 57 56 58 56 56 47 47 80 80

• Main principle
• Superhet with RF-stage

• Tuned circuits
• 7 AM circuit(s)

• Wave bands
• Broadcast plus more than 2 Short Wave bands.

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

• Loudspeaker
• Electro Magnetic Dynamic LS (moving-coil with field excitation coil)

• from Radiomuseum.org
• Model: 12 Tube Super SR233 - Radolek Co., Chicago

• Notes
• push pull af output stage.

• Circuit diagram reference
• Rider's Perpetual, Volume 4 = ca. 1934 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