• Country
• United States of America (USA)

• Manufacturer / Brand
• Motorola Inc. (ex Galvin Mfg.Co. Chicago); Schaumburg (IL)

• Year
• 1939–1942

• Category
• Broadcast Receiver - or past WW2 Tuner

• Radiomuseum.org ID
• 48857

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

• Number of Tubes
• 5

• Valves / Tubes
• 12SA7GT 12SK7GT 12SQ7GT 50L6GT 35Z5GT

• Main principle
• Superheterodyne (common); ZF/IF 455 kHz

• Tuned circuits
• 6 AM circuit(s)

• Wave bands
• Broadcast only (MW).

• Power type and voltage
• AC/DC-set / 117 Volt

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

• Material
• Catalin (a brand name for a thermosetting polymer popular in the 1930s and 1940s - a phenol formaldehyde resin - like Bakelite, but a two-stage process with a lot of work afterwards).

• from Radiomuseum.org
• Model: 51X16 S-Grille - Motorola Inc. ex Galvin Mfg.Co

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

• Dimensions (WHD)
• 10 x 6.25 x 6 inch / 254 x 159 x 152 mm

• Notes

• Tuning Range 540 to 1720 kHz (kc). Is in Alabster White and Green Trim, 2-tone catalin cabinet. See also the same Motorola model 51X15 in Black and Mandarin Red Trim.

• External source of data
• Ernst Erb

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

• Circuit diagram reference
• Rider's Perpetual, Volume 13 = 1942 and before

• Mentioned in
• The Radio Collector's Directory and Price Guide 1921 - 1965

• Literature/Schematics (1)
• Machine Age to Jet Age II (page 199.)

• Literature/Schematics (3)
• Motorola Booklet H-329, for 1942.

• Other Models

• Here you find 4508 models, 2955 with images and 4002 with schematics for wireless sets etc. In French: TSF for Télégraphie sans fil.
  All listed radios etc. from Motorola Inc. (ex Galvin Mfg.Co. Chicago); Schaumburg (IL)