• Country
• United States of America (USA)

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

• Year
• 1949

• Category
• Broadcast Receiver - or past WW2 Tuner

• Radiomuseum.org ID
• 33843

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

• Number of Tubes
• 4

• Valves / Tubes
• 1R5 1T4 or 1L4 1S5 3S4

• Number of Transistors

• Semiconductors
• Selenium-Rectifier

• 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
• Line / Batteries (any type) / 117 or 67.5 + D: 2 x 1.5 Volt

• Loudspeaker
• Permanent Magnet Dynamic (PDyn) Loudspeaker (moving coil)

• Material
• Metal case

• from Radiomuseum.org
• Model: Tom Thumb Buddy - Automatic Radio Mfg. Co.;

• Shape
• Very small Portable or Pocket-Set (Handheld) < 8 inch.

• Dimensions (WHD)
• 4.25 x 7 x 4.12 inch / 108 x 178 x 105 mm

• Notes
• Selenium Rectifier

• External source of data
• Ernst Erb

• Source of data
• Collector's Guide to Antique Radios 4. Edition

• Circuit diagram reference
• Rider's Perpetual, Volume 18 = 1949 and before

• Mentioned in
• Guide to Old Radios

• Literature/Schematics (1)
• Photofact Folder, Howard W. SAMS (491-7 Set 53 Folder 7)

• Other Models

• Here you find 401 models, 164 with images and 320 with schematics for wireless sets etc. In French: TSF for Télégraphie sans fil.
  All listed radios etc. from Automatic Radio Mfg. Co.; Boston (MA)