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Majestic 72 Louis XVI Ch= 70 - 7B Late

Majestic 72 Louis XVI Ch= 70 - 7B; Grigsby-Grunow - (ID = 676653) Radio
 
Majestic 72 Louis XVI Ch= 70 - 7B; Grigsby-Grunow - (ID = 676654) Radio
 
Majestic 72 Louis XVI Ch= 70 - 7B; Grigsby-Grunow - (ID = 676655) Radio
 
Majestic 72 Louis XVI Ch= 70 - 7B; Grigsby-Grunow - (ID = 676656) Radio
 
Majestic 72 Louis XVI Ch= 70 - 7B; Grigsby-Grunow - (ID = 676657) Radio
 
Majestic 72 Louis XVI Ch= 70 - 7B; Grigsby-Grunow - (ID = 676658) Radio
 
Majestic 72 Louis XVI Ch= 70 - 7B; Grigsby-Grunow - (ID = 676659) Radio
 
Majestic 72 Louis XVI Ch= 70 - 7B; Grigsby-Grunow - (ID = 676660) Radio
 
Majestic 72 Louis XVI Ch= 70 - 7B; Grigsby-Grunow - (ID = 676662) Radio
 
Majestic 72 Louis XVI Ch= 70 - 7B; Grigsby-Grunow - (ID = 676663) Radio
Majestic 72 Louis XVI Ch= 70 - 7B; Grigsby-Grunow - (ID = 1900826) Radio Majestic 72 Louis XVI Ch= 70 - 7B; Grigsby-Grunow - (ID = 1900827) Radio
Majestic 72 Louis XVI Ch= 70 - 7B; Grigsby-Grunow - (ID = 1900829) Radio Majestic 72 Louis XVI Ch= 70 - 7B; Grigsby-Grunow - (ID = 1900828) Radio
Majestic 72 Louis XVI Ch= 70 - 7B; Grigsby-Grunow - (ID = 1900811) Radio Majestic 72 Louis XVI Ch= 70 - 7B; Grigsby-Grunow - (ID = 1900813) Radio
Majestic 72 Louis XVI Ch= 70 - 7B; Grigsby-Grunow - (ID = 1900830) Radio Majestic 72 Louis XVI Ch= 70 - 7B; Grigsby-Grunow - (ID = 1900831) Radio
Majestic 72 Louis XVI Ch= 70 - 7B; Grigsby-Grunow - (ID = 1659870) Radio Majestic 72 Louis XVI Ch= 70 - 7B; Grigsby-Grunow - (ID = 1659871) Radio
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Majestic 72 Louis XVI Ch= 70 - 7B; Grigsby-Grunow - (ID = 1900826) Radio
Grigsby-Grunow -: Majestic 72 Louis XVI Ch= 70 - 7B [Radio] ID = 1900826 1400x1557
Select picture or schematic to display from thumbnails on the right and click for download.
For model Majestic 72 Louis XVI Ch= 70 - 7B Late, Grigsby-Grunow (-Hinds) Co. (Majestic pre 1933); Chicago (IL):
Auction picture courtesy of liveauctioneers
 
Country:  United States of America (USA)
Manufacturer / Brand:  Grigsby-Grunow (-Hinds) Co. (Majestic pre 1933); Chicago (IL)
Year: 1928/1929 Category: Broadcast Receiver - or past WW2 Tuner
Valves / Tubes 8: 226 226 226 227 226 171A 171A 280
Main principle Special principle (see notes); 3 AF stage(s)
Tuned circuits 4 AM circuit(s)
Wave bands Broadcast only (MW).
Details
Power type and voltage Alternating Current supply (AC) / 90-130 Volt
Loudspeaker Electro Magnetic Dynamic LS (moving-coil with field excitation coil)
Power out
from Radiomuseum.org Model: Majestic 72 Louis XVI Ch= 70 - 7B [Late] - Grigsby-Grunow -Hinds Co.
Material Wooden case
Shape Console, Highboy (legs > 50 %).
Dimensions (WHD) 25.5 x 52 x 17 inch / 648 x 1321 x 432 mm
Notes

One dial (primary tuning control knob) This set has a push-pull output stage using two 171A power tubes. It is made of walnut with burl walnut front panels and came with a Majestic electric power unit and Majestic dynamic power speaker.
Model 72 uses the 7P6 or 7P3 (7BP6 or 7BP3 for chassis 70-B) power unit.

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.

Price in first year of sale 167.50 $
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) Grigsby-Grunow 1928 Flyer


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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