• Year
  • 1961
perfect model
  • Category
  • Broadcast Receiver - or past WW2 Tuner
  • Radiomuseum.org ID
  • 254270

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

 Technical Specifications

  • Number of Tubes
  • 6
  • Main principle
  • Superheterodyne (common); ZF/IF 455 kHz; 2 AF stage(s)
  • Tuned circuits
  • 6 AM circuit(s)
  • Wave bands
  • Broadcast only (MW).
  • Power type and voltage
  • Alternating Current supply (AC) / 60 cycles, 120 Volt
  • Loudspeaker
  • Permanent Magnet Dynamic (PDyn) Loudspeaker (moving coil) / Ø 5 inch = 12.7 cm
  • Material
  • Plastics (no bakelite or catalin)
  • from Radiomuseum.org
  • Model: C20B Ch= HS-815 - Motorola Inc. ex Galvin Mfg.Co
  • Shape
  • Tablemodel with Clock ((Alarm-) Clock Radio).
  • Notes
  • The Motorola C20B is an AC operated 6 Tube AM clock radio with Selenium Rectifier and Push-Pull output stage.  AM Band Tuning Range: 535 to 1620KHz.

    The following models use the same schematic and cabinet but have different cabinet colors:

    Model Cabinet Colors
    C20B Blue
    C20P Pink
    C20W White/Charcoal

    The Motorola service manual has service information for the following models: A15, A16, A17, A18, A19 series and the C15, C16, C17, C18, C19, C20 series. The A series are radio's without clocks, while the C series are radio's with clocks.

    WARNING:  When servicing this radio, an isolation transformer should be used between the power line and the radio.

  • Circuit diagram reference
  • Beitman Radio Diagrams Vol. 21, 1961
  • Literature/Schematics (1)
  • - - Manufacturers Literature (Motorola Datasheet 68P60011A71 Dated 6-61)
  • Author
  • Model page created by John Kusching. See "Data change" for further contributors.

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The model C20B is part of the collections of the following members.

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