• Country
• United States of America (USA)

• Manufacturer / Brand
• Automatic Radio Mfg. Co.; Boston (MA)

• Year
• 1938

• Category
• Broadcast Receiver - or past WW2 Tuner

• Radiomuseum.org ID
• 33761

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

• Number of Tubes
• 4

• Valves / Tubes
• 6K7GT 6J7GT 25A6GT 25Z6GT

• Main principle
• TRF (Tuned-Radio-Frequency but use of regeneration unknown)

• Tuned circuits
• 2 AM circuit(s)

• Wave bands
• Broadcast only (MW).

• Power type and voltage
• AC/DC-set / 110 Volt

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

• Material
• Various materials

• from Radiomuseum.org
• Model: Tom Thumb 933 [Series 2] - Automatic Radio Mfg. Co.;

• Shape
• Tablemodel without push buttons, Mantel/Midget/Compact up to 14

• Notes

• Material: Metal or Catalin. Available in the colors: red, green, blue, gray or pink.

• External source of data
• Ernst Erb

• Source of data
• The Radio Collector's Directory and Price Guide 1921 - 1965

• Circuit diagram reference
• Rider's Perpetual, Volume 9 = 1938 and before

• Mentioned in
• Machine Age to Jet Age II

• Literature/Schematics (1)
• Table Top Radios Vol. 4 Stein 2003 (page 54.)

• Other Models

• Here you find 401 models, 163 with images and 321 with schematics for wireless sets etc. In French: TSF for Télégraphie sans fil.
  All listed radios etc. from Automatic Radio Mfg. Co.; Boston (MA)