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Majestic 93 Ch= 90-B

Majestic 93 Ch= 90-B; Grigsby-Grunow - (ID = 216619) Radio
Majestic 93 Ch= 90-B; Grigsby-Grunow - (ID = 677423) Radio
Majestic 93 Ch= 90-B; Grigsby-Grunow - (ID = 450500) Radio Majestic 93 Ch= 90-B; Grigsby-Grunow - (ID = 450666) Radio
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Majestic 93 Ch= 90-B; Grigsby-Grunow - (ID = 450500) Radio
Grigsby-Grunow -: Majestic 93 Ch= 90-B [Radio] ID = 450500 450x581
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For model Majestic 93 Ch= 90-B, Grigsby-Grunow (-Hinds) Co. (Majestic pre 1933); Chicago (IL):
Add April 1930
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).
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 Model: Majestic 93 Ch= 90-B - Grigsby-Grunow -Hinds Co.
Material Wooden case
Shape Console, Lowboy (legs < 50 %).
Notes The model Majestic 93 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 167.00 $
Source of data The Radio Collector's Directory and Price Guide 1921 - 1965
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.