• Country
• United States of America (USA)

• Manufacturer / Brand
• Motorola Inc. (ex Galvin Mfg.Co. Chicago); Schaumburg (IL)

• Year
• 1954 ?

• Category
• Car Radio, perhaps also + sound player/recorder

• Radiomuseum.org ID
• 136335

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

• Number of Tubes
• 6

• Valves / Tubes
• 6BD6 6BE6 6BD6 6CR6 6AQ5 6X4

• Main principle
• Superheterodyne (common); ZF/IF 455 kHz

• Wave bands
• Broadcast only (MW).

• Power type and voltage
• Storage Battery for all (e.g. for car radios and amateur radios) / 6 Volt

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

• Material
• Metal case

• from Radiomuseum.org
• Model: CTM4 - Motorola Inc. ex Galvin Mfg.Co

• Shape
• Chassis only or for «building in»

• Notes

• Motorola model CTM4 is a battery operated custom built AM superheterodyne automobile receiver. Sams photofact set 305 folder 12 date 2-56 features the Motorola models CTM4 and CTM4A as the same schematic. Model CTM4A for 1954 Chevrolet.

• Literature/Schematics (1)
• Photofact Folder, Howard W. SAMS (Set 305 folder 12 date 2-56)

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

• Other Models

• Here you find 4623 models, 2967 with images and 4122 with schematics for wireless sets etc. In French: TSF for Télégraphie sans fil.
  All listed radios etc. from Motorola Inc. (ex Galvin Mfg.Co. Chicago); Schaumburg (IL)