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Majestic Gothic 307 Ch= 300 (300-A)

Majestic Gothic 307 Ch= 300 ; Grigsby-Grunow - (ID = 670770) Radio
 
Majestic Gothic 307 Ch= 300 ; Grigsby-Grunow - (ID = 670771) Radio
 
Majestic Gothic 307 Ch= 300 ; Grigsby-Grunow - (ID = 670772) Radio
 
Majestic Gothic 307 Ch= 300 ; Grigsby-Grunow - (ID = 671122) Radio
Majestic Gothic 307 Ch= 300 ; Grigsby-Grunow - (ID = 1244512) Radio Majestic Gothic 307 Ch= 300 ; Grigsby-Grunow - (ID = 933742) Radio
Majestic Gothic 307 Ch= 300 ; Grigsby-Grunow - (ID = 941664) Radio Majestic Gothic 307 Ch= 300 ; Grigsby-Grunow - (ID = 1130546) Radio
Majestic Gothic 307 Ch= 300 ; Grigsby-Grunow - (ID = 1244517) Radio Majestic Gothic 307 Ch= 300 ; Grigsby-Grunow - (ID = 1244521) Radio
Majestic Gothic 307 Ch= 300 ; Grigsby-Grunow - (ID = 1507163) Radio Majestic Gothic 307 Ch= 300 ; Grigsby-Grunow - (ID = 1556874) Radio
Majestic Gothic 307 Ch= 300 ; Grigsby-Grunow - (ID = 1556875) Radio
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Majestic Gothic 307 Ch= 300 ; Grigsby-Grunow - (ID = 1244512) Radio
Grigsby-Grunow -: Majestic Gothic 307 Ch= 300 [Radio] ID = 1244512 408x600
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Pour le modèle Majestic Gothic 307 Ch= 300 (300-A), Grigsby-Grunow (-Hinds) Co. (Majestic pre 1933); Chicago (IL)
 
Pays:  Etats-Unis
Fabricant / Marque:  Grigsby-Grunow (-Hinds) Co. (Majestic pre 1933); Chicago (IL)
Année: 1932 Catégorie: Radio - ou tuner d'après la guerre 1939-45
Lampes / Tubes 11: G-58-S G-56 G-58-S G-58-S G-4-S G-57-S G-57-S G-58-S G-47 G-47 G-82
Principe général Super hétérodyne avec étage HF; FI/IF 175 kHz
Circuits accordés 7 Circuits MA (AM)
Gammes d'ondes Ondes Moyennes (PO) uniquement.
Particularités
Tension / type courant Alimentation Courant Alternatif (CA). / 117 Volt
Haut-parleur HP dynamique à aimant électrodynamique (avec bobine)
Puissance de sortie
De Radiomuseum.org Modèle: Majestic Gothic 307 Ch= 300 - Grigsby-Grunow -Hinds Co.
Matière Boitier en bois
Forme Console basse. Pieds < 50% de la hauteur.
Remarques Introduced Sept. 1932. The series 300 models are fitted either with a large G-14-F speaker or have twin speaker G-19-B and G-19-C. Grigsby-Grunow uses here the first time their "Automatic Synchro-Silent Tuning", variing a tuning light by a reactor with 3 legs of iron core and suppressing signals below a certain level between stations with an additional tube. Two legs of the Reactor are connected in series with the pilot light, while the winding on the center leg is connected in series with the plates of the RF First Detector, and IF tubes. An electrolytic condenser (C-5) shunts the center winding for not getting any AC if there are unbalances. They call the system also "Reactance Resonance Indicator". When a station is tuned in, an automatic bias voltage is built across Resistor R-9, causing the pilot light to dim.

Description in Rider's Majestic 3-19:
"This is a reactor with three windings on three legs respectively of the iron core. The windings on the two end legs are connected in series with the pilot lamp, while the winding on the center leg is connected in series with the plates of the RF, 1st Detector, and IF tubes. An electrolytic condenser is connected so as to shunt the center winding. If no station is tuned in, a relatively large plate current will flow through the center winding. This saturates the iron core so that the reactance of the two outer windings is quite low, and considerable current therefore flows through the pilot light. When a station is tuned in, it operates the G-4-S Automatic Volume Control tube so that an automatic bias voltage is built up across Resistor R-9. This bias voltage is, in turn, impressed upon the control grids of the RF, 1st Detector and IF tubes. When this bias is impressed on these amplifier tubes, the normal AVC action the pilot light is therefore reduced, causing the pilot light to dim."

Replacing of the unique "Spray Shield Tubes" is done by ordinary tubes plus installation of a tube shield.
Prix de mise sur le marché 89.50 $
Source extérieure Ernst Erb
Source Radio Collector`s Guide 1921-1932
Source du schéma Rider's Perpetual, Volume 3 = 1933 and before
Littérature The Radio Collector's Directory and Price Guide 1921 - 1965 (Rider's Changes 7-11)
Schémathèque (1) Pre-War Consoles


Tous les appareils de Grigsby-Grunow (-Hinds) Co. (Majestic pre 1933); Chicago (IL)
Vous pourrez trouver sous ce lien 200 modèles d'appareils, 118 avec des images et 156 avec des schémas.




  
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