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Majestic 181 Ch= 180

Majestic 181 Ch= 180; Grigsby-Grunow - (ID = 244696) Radio
 
Majestic 181 Ch= 180; Grigsby-Grunow - (ID = 674743) Radio
 
Majestic 181 Ch= 180; Grigsby-Grunow - (ID = 674744) Radio
 
Majestic 181 Ch= 180; Grigsby-Grunow - (ID = 674745) Radio
 
Majestic 181 Ch= 180; Grigsby-Grunow - (ID = 674749) Radio
 
Majestic 181 Ch= 180; Grigsby-Grunow - (ID = 676637) Radio
Majestic 181 Ch= 180; Grigsby-Grunow - (ID = 816628) Radio Majestic 181 Ch= 180; Grigsby-Grunow - (ID = 816630) Radio
Majestic 181 Ch= 180; Grigsby-Grunow - (ID = 816631) Radio Majestic 181 Ch= 180; Grigsby-Grunow - (ID = 1859225) Radio
Majestic 181 Ch= 180; Grigsby-Grunow - (ID = 1859226) Radio Majestic 181 Ch= 180; Grigsby-Grunow - (ID = 1859227) Radio
Majestic 181 Ch= 180; Grigsby-Grunow - (ID = 1859228) Radio Majestic 181 Ch= 180; Grigsby-Grunow - (ID = 1859229) Radio
Majestic 181 Ch= 180; Grigsby-Grunow - (ID = 1859230) Radio Majestic 181 Ch= 180; Grigsby-Grunow - (ID = 1859231) Radio
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Majestic 181 Ch= 180; Grigsby-Grunow - (ID = 816628) Radio
Grigsby-Grunow -: Majestic 181 Ch= 180 [Radio] ID = 816628 600x729
Select picture or schematic to display from thumbnails on the right and click for download.
For model Majestic 181 Ch= 180, Grigsby-Grunow (-Hinds) Co. (Majestic pre 1933); Chicago (IL):
Ebay 170524994457
 
Country:  United States of America (USA)
Manufacturer / Brand:  Grigsby-Grunow (-Hinds) Co. (Majestic pre 1933); Chicago (IL)
Year: 1929 Category: Broadcast Receiver - or past WW2 Tuner
Valves / Tubes 9: 27 27 27 27 27 50 50 81 81
Main principle TRF without regeneration; 3 AF stage(s); Neutrodyne
Tuned circuits 4 AM circuit(s)
Wave bands Broadcast only (MW).
Details Record Player (not changer)
Power type and voltage Alternating Current supply (AC) / 90-130 Volt
Loudspeaker Electro Magnetic Dynamic LS (moving-coil with field excitation coil) / Ø 8 inch = 20.3 cm
Power out
from Radiomuseum.org Model: Majestic 181 Ch= 180 - Grigsby-Grunow -Hinds Co.
Material Wooden case
Shape Console, Lowboy (legs < 50 %).
Notes

This radio is a cascade of 3 individual TRF stages, each with its own feedback coil forming a Wheatstone bridge acting as a Hazeltine neutralization for the triode (described as the RFL circuit in contemporary sources). The feedback polarity is reversed with respect to the signal polarity through the Cag Miller-capacitance, in effect neutralising the triode tendency to oscillate.

The antenna circuit has a separate tuning coil, to be readjusted with each tuned frequency.

The tuning scale is graduated with 2 scales: One in frequency from 550 to 1500 kHz and the other as a linear scale from 0 to 100. 

LF coupling between stages is done by transformers - Push-pull output.

The unit contains a separate 8P6 or 8P3 power supply unit with individual transformers for the filaments and the 425 Volt anode supply. A current regulator is included in the primary circuit of the power transformers to compensate for mains voltage changes between 90 and 130 Volt AC.

Price in first year of sale 265.00 $
Collectors' prices  
External source of data Ernst Erb
Source of data Radio Collector`s Guide 1921-1932
Circuit diagram reference Rider's Perpetual, Volume 1 = 1931/1934 (for 1919-1931)
Mentioned in The Radio Collector's Directory and Price Guide 1921 - 1965
Literature/Schematics (1) Rider's Perpetual, Volume 2 = 1932 and before


All listed radios etc. from Grigsby-Grunow (-Hinds) Co. (Majestic pre 1933); Chicago (IL)
Here you find 200 models, 118 with images and 154 with schematics for wireless sets etc. In French: TSF for Télégraphie sans fil.



  
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