• Country
• United States of America (USA)

• Manufacturer / Brand
• Radio Specialty Shop; Oakland, California

• Year
• 1922

• Category
• Radio module pre 1926 (not a part, not a key)

• Radiomuseum.org ID
• 338454

• Number of Tubes
• 2

• Valves / Tubes
• UV201 UV201

• Main principle
• Radio Frequency Amplification only

• Wave bands
• Broadcast only (MW).

• Power type and voltage
• Storage and/or dry batteries / 6, 22 Volt

• Loudspeaker
• - - No sound reproduction output.

• Material
• Wooden case, TUBES VISIBLE.

• from Radiomuseum.org
• Model: Radio Frequency Amplifier Type 221 - Radio Specialty Shop; Oakland,

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

• Dimensions (WHD)
• 9 x 8.5 x 12.5 inch / 229 x 216 x 318 mm

• Author
• Model page created by Dan Dames. See "Data change" for further contributors.

• Other Models

• Here you find 2 models, 2 with images and 0 with schematics for wireless sets etc. In French: TSF for Télégraphie sans fil.
  All listed radios etc. from Radio Specialty Shop; Oakland, California