• Country
• United States of America (USA)

• Manufacturer / Brand
• Grigsby-Grunow (-Hinds) Co. (Majestic pre 1933); Chicago (IL)

• Year
• 1931

• Category
• Broadcast Receiver - or past WW2 Tuner

• Radiomuseum.org ID
• 90012

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

• Number of Tubes
• 8

• Valves / Tubes
• 51 27 51 51 27 45 45 80

• Main principle
• Superhet with RF-stage; ZF/IF 175 kHz; 3 AF stage(s); Screengrid 1926-1935

• Tuned circuits
• 7 AM circuit(s)

• Wave bands
• Broadcast only (MW).

• Power type and voltage
• Alternating Current supply (AC) / 117 Volt

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

• Material
• Wooden case

• from Radiomuseum.org
• Model: Majestic 21 Ch= 20 - Grigsby-Grunow -Hinds Co.

• Shape
• Tablemodel, Tombstone = decorative upright, not cathedral but can have rounded edges.

• Dimensions (WHD)
• 16 x 19 x 11 inch / 406 x 483 x 279 mm

• Notes
• Introduced January 1931. It is a cathedral with slight shoulders, a superhet which uses Majestic tube types; G-51 RF amp, IF amp, and converter; G-27 oscillator and power detector; push-pull G-45's audio output; G-80 rectifier. The Majestic 20 chassis is totally enclosed and very deep: Be careful, some wires have to be removed before the cover can be opened.

• Net weight (2.2 lb = 1 kg)
• 54 lb (54 lb 0 oz) / 24.516 kg

• Price in first year of sale
• 69.50 $

• External source of data
• Ken Kretzer, Sacramento CA

• Circuit diagram reference
• Rider's Perpetual, Volume 1 = 1931/1934 (for 1919-1931)

• Literature/Schematics (1)
• Beitman Radio Diagrams, Vol. 01, 1926-1938

• Author
• Model page created by Ernst Erb. See "Data change" for further contributors.

• Other Models

• Here you find 201 models, 122 with images and 156 with schematics for wireless sets etc. In French: TSF for Télégraphie sans fil.
  All listed radios etc. from Grigsby-Grunow (-Hinds) Co. (Majestic pre 1933); Chicago (IL)