• Country
• United States of America (USA)

• Manufacturer / Brand
• Hetro Electrical Industries; Chicago, IL

• Year
• 1936

• Category
• Broadcast Receiver - or past WW2 Tuner

• Radiomuseum.org ID
• 127851

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

• Number of Tubes
• 5

• Valves / Tubes
• 6A8 6K7 6Q7 25A6 25Z6

• Number of Transistors

• Semiconductors
• K49C

• Main principle
• Superheterodyne (common); ZF/IF 456 kHz; 2 AF stage(s)

• Tuned circuits
• 6 AM circuit(s)

• Wave bands
• Broadcast, Long Wave and Short Wave.

• Power type and voltage
• AC/DC-set / 100-125 Volt

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

• from Radiomuseum.org
• Model: F-12 Ch= FA - Hetro Electrical Industries;

• Notes
• LW (140-400 kHz), BC 550-1700 kHz) and SW (5.5.-18.0 MHz) bands.

• Circuit diagram reference
• Rider's Perpetual, Volume 7 = 1936 and before

• Author
• Model page created by Götz Linss † 27.06.21. See "Data change" for further contributors.

• Other Models

• Here you find 79 models, 5 with images and 74 with schematics for wireless sets etc. In French: TSF for Télégraphie sans fil.
  All listed radios etc. from Hetro Electrical Industries; Chicago, IL