Majestic Ch= 320
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
- 1932
- Category
- Broadcast Receiver - or past WW2 Tuner
- Radiomuseum.org ID
- 43636
Click on the schematic thumbnail to request the schematic as a free document.
- Number of Tubes
- 12
- Main principle
- Superhet with RF-stage; ZF/IF 175 kHz
- Tuned circuits
- 7 AM circuit(s)
- Wave bands
- Broadcast only (MW).
- Power type and voltage
- Alternating Current supply (AC)
- Loudspeaker
- 2 Loudspeakers
- Material
- Metal case
- from Radiomuseum.org
- Model: Majestic Ch= 320 - Grigsby-Grunow -Hinds Co.
- 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
- Other Models
-
Here you find 201 models, 122 with images and 156 with schematics for wireless sets etc. In French: TSF for Télégraphie sans fil.
All listed radios etc. from Grigsby-Grunow (-Hinds) Co. (Majestic pre 1933); Chicago (IL)