• Country
• United States of America (USA)

• Manufacturer / Brand
• Crosley Radio Corp.; Cincinnati (OH)

• Year
• 1928/1929

• Category
• Broadcast Receiver - or past WW2 Tuner

• Radiomuseum.org ID
• 184407

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

• Number of Tubes
• 7

• Valves / Tubes
• UX226 UX226 UX226 UY227 UX226 UX171A UX280

• Main principle
• TRF without regeneration; 3 AF stage(s); Neutrodyne

• Tuned circuits
• 3 AM circuit(s)

• Wave bands
• Broadcast only (MW).

• Power type and voltage
• Alternating Current supply (AC) / 60 or 25 cycles 110 volt or 25 cycles 220 Volt

• Loudspeaker
• -Loudspeaker incorporated, but system not known.

• Material
• Wooden case

• from Radiomuseum.org
• Model: Gemchest 609 [Manchu Black] - Crosley Radio Corp.;

• Shape
• Console, Lowboy (legs < 50 %).

• Notes
• One dial (primary tuning control knob) The grille was originally plain silver (not painted in colors). The models Gemchest 609, Gembox 609, Gembox 610 and Gembox 610 as AC versions share the same schematic with either a tube line up of UX-226, UX-226, UX-226, UY-227, UX-226, UX-171A, UX-280 or Cunningham tubes CX326, CX326, CX326, C327, CX362, CX371A and CX380. Gemchest is a console, Gembox a table radio. The mains transformer is either for 110 Volt 60 cycles, 110 Volt 25 cycles or 220 Volt 25 cycles.
  
  The Crosley Gemchest was sold in colors Mandarin Red, Nanking Green and Manchu Black. Please regard the colors when uploading pictures.

• Source of data
• Radio Collector`s Guide 1921-1932

• Author
• Model page created by Ernst Erb. See "Data change" for further contributors.

• Other Models

• Here you find 1773 models, 1042 with images and 1257 with schematics for wireless sets etc. In French: TSF for Télégraphie sans fil.
  All listed radios etc. from Crosley Radio Corp.; Cincinnati (OH)