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Majestic Ch= 320

Majestic Ch= 320; Grigsby-Grunow - (ID = 670764) Radio
 
Majestic Ch= 320; Grigsby-Grunow - (ID = 670765) Radio
 
Majestic Ch= 320; Grigsby-Grunow - (ID = 670766) Radio
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Majestic Ch= 320; Grigsby-Grunow - (ID = 670764) Radio
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Country:  United States of America (USA)
Manufacturer / Brand:  Grigsby-Grunow (-Hinds) Co. (Majestic pre 1933); Chicago (IL)
Year: 1932 Category: Broadcast Receiver - or past WW2 Tuner
Valves / Tubes 12: G-58-S G-56 G-58-S G-58-S G-4-S G-4-S G-57-S G-57-S G-58-S G-47 G-47 G-82
Main principle Superhet with RF-stage; ZF/IF 175 kHz
Tuned circuits 7 AM circuit(s)
Wave bands Broadcast only (MW).
Details
Power type and voltage Alternating Current supply (AC)
Loudspeaker 2 Loudspeakers
Power out
from Radiomuseum.org Model: Majestic Ch= 320 - Grigsby-Grunow -Hinds Co.
Material Metal case
Shape Chassis only or for «building in»
Notes The Majestic model 320 from Grigsby-Grunow is - together with the Majestic model 300 - the first model having a "saturable core reactor" as tuning aid. Grigsby-Grunow Co. called it "Synchro-Silent Tuning" or "Reactance Resonance Indicator". See post 5 here. The model 320 has two strong electrodynamic loudspeakers (field resistance 520 ohms, voice coil resistance 1.7 ohms) but there is also single loudspeaker operation possible with the G-14-F loudspeaker.
External source of data Ernst Erb
Circuit diagram reference Rider's Perpetual, Volume 3 = 1933 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 156 with schematics for wireless sets etc. In French: TSF for Télégraphie sans fil.



  
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