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Majestic Ch= 180

Majestic Ch= 180; Grigsby-Grunow - (ID = 244694) Radio
 
Majestic Ch= 180; Grigsby-Grunow - (ID = 674740) Radio
 
Majestic Ch= 180; Grigsby-Grunow - (ID = 674741) Radio
 
Majestic Ch= 180; Grigsby-Grunow - (ID = 674742) Radio
 
Majestic Ch= 180; Grigsby-Grunow - (ID = 674747) Radio
 
Majestic Ch= 180; Grigsby-Grunow - (ID = 676635) Radio
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Majestic Ch= 180; Grigsby-Grunow - (ID = 244694) Radio
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Land:  USA
Hersteller / Marke:  Grigsby-Grunow (-Hinds) Co. (Majestic pre 1933); Chicago (IL)
Jahr: 1928 Kategorie: Rundfunkempfänger (Radio - oder Tuner nach WW2)
Röhren 9: 27 27 27 27 27 50 50 81 81
Hauptprinzip Geradeaus ohne Rückkopplung; 3 NF-Stufe(n); Neutrodyne
Anzahl Kreise 4 Kreis(e) AM
Wellenbereiche Mittelwelle, keine anderen.
Spezialitäten
Betriebsart / Volt Wechselstromspeisung / 90-130 Volt
Lautsprecher Dynamischer LS, mit Erregerspule (elektrodynamisch)
Belastbarkeit/Leistung
von Radiomuseum.org Modell: Majestic Ch= 180 - Grigsby-Grunow -Hinds Co.
Material Metallausführung
Form Chassis - Einbaugerät
Bemerkung

Push-pull af output stage; using the 8P6 or 8P3 power unit; chassis for Majestic model 181.

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.

Datenherkunft extern Ernst Erb
Schaltungsnachweis Rider's Perpetual, Volume 1 = 1931/1934 (for 1919-1931)
Literatur/Schema (1) Rider's Perpetual, Volume 2 = 1932 and before


Alle gelisteten Radios usw. von Grigsby-Grunow (-Hinds) Co. (Majestic pre 1933); Chicago (IL)
Hier finden Sie 200 Modelle, davon 118 mit Bildern und 156 mit Schaltbildern.



  
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