• Country
• United States of America (USA)

• Manufacturer / Brand
• General Household Utilities Co. (Grunow); Chicago Ill.

• Year
• 1933

• Category
• Broadcast Receiver - or past WW2 Tuner

• Radiomuseum.org ID
• 85985

• • Brand: Grunow (trade name)

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

• Number of Tubes
• 5

• Valves / Tubes
• 78 6F7 75 43 25Z5

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

• Tuned circuits
• 5 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) / Ø 5 inch = 12.7 cm

• Material
• Wooden case

• from Radiomuseum.org
• Model: Grunow 502A Ch= 5-B - General Household Utilities Co

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

• Dimensions (WHD)
• 11.5 x 8 x 6 inch / 292 x 203 x 152 mm

• Notes
• Resistance line cord. Steins dating is in error.
  There is also a model 502 using chassis 5-C and different tube complement for battery operation.

• Net weight (2.2 lb = 1 kg)
• 3.6 kg / 7 lb 14.9 oz (7.93 lb)

• External source of data
• Stein's volume 2 page 152

• Source of data
• - - Data from my own collection

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

• Literature/Schematics (1)
• Rider's Perpetual, Volume 4 = ca. 1934 and before (see chassis for model 501)

• Other Models

• Here you find 138 models, 100 with images and 126 with schematics for wireless sets etc. In French: TSF for Télégraphie sans fil.
  All listed radios etc. from General Household Utilities Co. (Grunow); Chicago Ill.