Majestic Ch= 180

Grigsby-Grunow (-Hinds) Co. (Majestic pre 1933); Chicago (IL)

Daten
Forum
Bilder
Sammlungen

  • Jahr
  • 1928
  • Kategorie
  • Rundfunkempfänger (Radio - oder Tuner nach WW2)
  • Radiomuseum.org ID
  • 43607

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 Technische Daten

  • Anzahl Röhren
  • 9
  • Hauptprinzip
  • Geradeaus ohne Rückkopplung; 3 NF-Stufe(n); Neutrodyne
  • Anzahl Kreise
  • 4 Kreis(e) AM
  • Wellenbereiche
  • Mittelwelle, keine anderen.
  • Betriebsart / Volt
  • Wechselstromspeisung / 90-130 Volt
  • Lautsprecher
  • Dynamischer LS, mit Erregerspule (elektrodynamisch)
  • Material
  • Metallausführung
  • von Radiomuseum.org
  • Modell: Majestic Ch= 180 - Grigsby-Grunow -Hinds Co.
  • 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)

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