• Country
• United States of America (USA)

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

• Year
• 1933

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

• Radiomuseum.org ID
• 138546

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

• Number of Tubes
• 7

• Valves / Tubes
• 78 77 78 85 35 12A5 12A5

• Main principle
• Superhet with RF-stage; ZF/IF 456 kHz

• Tuned circuits
• 7 AM circuit(s)

• Wave bands
• Broadcast only (MW).

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

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

• from Radiomuseum.org
• Model: 77-A Ch= B series - Motorola Inc. ex Galvin Mfg.Co

• Notes
• Sync.vibrator for +B.

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

• Literature/Schematics (1)
• Riders 4-13 , Riders 7-12

• Author
• Model page created by Dirk Taekels. See "Data change" for further contributors.

• Other Models

• Here you find 4508 models, 2955 with images and 4002 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)