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Majestic 90 Ch= 90-B

Majestic 90 Ch= 90-B; Grigsby-Grunow - (ID = 677424) Radio
 
Majestic 90 Ch= 90-B; Grigsby-Grunow - (ID = 216617) Radio
Majestic 90 Ch= 90-B; Grigsby-Grunow - (ID = 450598) Radio Majestic 90 Ch= 90-B; Grigsby-Grunow - (ID = 823225) Radio
Majestic 90 Ch= 90-B; Grigsby-Grunow - (ID = 823226) Radio Majestic 90 Ch= 90-B; Grigsby-Grunow - (ID = 823227) Radio
Majestic 90 Ch= 90-B; Grigsby-Grunow - (ID = 823228) Radio Majestic 90 Ch= 90-B; Grigsby-Grunow - (ID = 823229) Radio
Majestic 90 Ch= 90-B; Grigsby-Grunow - (ID = 823230) Radio Majestic 90 Ch= 90-B; Grigsby-Grunow - (ID = 823231) Radio
Majestic 90 Ch= 90-B; Grigsby-Grunow - (ID = 823232) Radio Majestic 90 Ch= 90-B; Grigsby-Grunow - (ID = 823233) Radio
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Majestic 90 Ch= 90-B; Grigsby-Grunow - (ID = 450598) Radio
Grigsby-Grunow -: Majestic 90 Ch= 90-B [Radio] ID = 450598 539x698
Select picture or schematic to display from thumbnails on the right and click for download.
For model Majestic 90 Ch= 90-B, Grigsby-Grunow (-Hinds) Co. (Majestic pre 1933); Chicago (IL)
 
Country:  United States of America (USA)
Manufacturer / Brand:  Grigsby-Grunow (-Hinds) Co. (Majestic pre 1933); Chicago (IL)
Year: 1929/1930 Category: Broadcast Receiver - or past WW2 Tuner
Valves / Tubes 8: 27 27 27 27 27 45 45 80
Main principle TRF without regeneration; 1 AF stage(s); Neutrodyne
Tuned circuits 5 AM circuit(s)
Wave bands Broadcast only (MW).
Details
Power type and voltage Alternating Current supply (AC) / Adjustment plate for 105, 115 and 125 Volt
Loudspeaker Electro Magnetic Dynamic LS (moving-coil with field excitation coil) / Ø 10 inch = 25.4 cm
Power out
from Radiomuseum.org Model: Majestic 90 Ch= 90-B - Grigsby-Grunow -Hinds Co.
Material Wooden case
Shape Console, Lowboy (legs < 50 %).
Dimensions (WHD) 27 x 50.5 x 18 inch / 686 x 1283 x 457 mm
Notes The model Majestic 90 is a console (lowboy stretcher base) with the chassis 90-B - often incorrectly called 90-B after the chassis. The chassis 90-B comes for 50-60 cycles or 25-40 cycles AC. Reason: There are two different values for the power supply: 3 condensers for 2 MF or two of them for 4 MF (for 25-40 cycles). For the antenna there is a local distance switch.

The chassis 90-B from Grigsby-Grunow Co. has a 5 gang variable condensator for tuning the T.R.F. balanced circuit with a single control. The selectivity control or trimmer functions by varying the inductance of the antenna input coil and permits adjusting the input circuit to exact resonance with the other tuned circuits. The detector tube feeds (via R.F. choke) directly the transformer for the push-pull output which drive the so called "Super-Dynamic Speaker" model G-3 from Grigsby-Grunow Company in Chicago. The models Majestic 90, Majestic 91 and Majestic 93 with its different cases use the same chassis 90-B.
Price in first year of sale 116.50 $
Circuit diagram reference Rider's Perpetual, Volume 1 = 1931/1934 (for 1919-1931)
Literature/Schematics (1) Beitman Radio Diagrams, Vol. 01, 1926-1938
Literature/Schematics (2) Radio Broadcast, Apr 1930, p. 354

Model page created by Walter Wiesmüller † May 2012. See "Data change" for further contributors.



All listed radios etc. from Grigsby-Grunow (-Hinds) Co. (Majestic pre 1933); Chicago (IL)
Here you find 200 models, 118 with images and 155 with schematics for wireless sets etc. In French: TSF for Télégraphie sans fil.




  
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