4AC1B Ch= 4A

Fairbanks, Morse & Co.; Chicago (IL)

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  • Year
  • 1937/1938
perfect model
  • Category
  • Broadcast Receiver - or past WW2 Tuner
  • Radiomuseum.org ID
  • 192745
    • alternative name: FMC
    • Brand: Welco

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

 Technical Specifications

  • Number of Tubes
  • 4
  • Main principle
  • Superheterodyne (common); ZF/IF 456 kHz; 2 AF stage(s)
  • Tuned circuits
  • 6 AM circuit(s)
  • Wave bands
  • Broadcast only (MW).
  • Power type and voltage
  • Storage and/or dry batteries / 2V & 4.5V & 136 Volt
  • Loudspeaker
  • Permanent Magnet Dynamic (PDyn) Loudspeaker (moving coil) / Ø 8 inch = 20.3 cm
  • Material
  • Wooden case
  • from Radiomuseum.org
  • Model: 4AC1B Ch= 4A - Fairbanks, Morse & Co.;
  • Shape
  • Console with any shape - in general
  • Notes

  • The Fairbanks Morse 4AC1B is an battery operated, 4 tube BC band receiver.  Uses chassis 4A. BC band frequency range is 540 to 1730kHz.  Has bias cell used to bias 1F7G tube.  Also has AVC and 2 stage audio circuit.

    The 4A and 4B chassis are the same chassis, however the 4A chassis came with a battery cable used to interface with standard A, B and C batteries, while the 4B chassis came with a synchronous vibrator power supply and cable used to interface with a 6V storage battery. Both the battery cables and the vibrator power supply have plugs, making them interchangable to the chassis.

    NOTE: 4A is the chassis number and NOT the model number.

    The following models use the 4A and 5A chassis and schematic:

    Model Number Chassis Batteries Needed Cabinet
    4AT5B 4A Standard A, B, C Table Model
    4AC1B 4A Standard A, B, C Console
    4BT5B 4B 6V Storage Table Model
    4BC1B 4B 6V Storage Console

     

  • Price in first year of sale
  • 49.95 $
  • Literature/Schematics (1)
  • - - Manufacturers Literature (Fairbanks Morse Service Notes Chassis Models 4A & 4B)

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