Majestic Ch= 180

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

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  • Année
  • 1928
  • Catégorie
  • Radio - ou tuner d'après la guerre 1939-45
  • Radiomuseum.org ID
  • 43607

Cliquez sur la vignette du schéma pour le demander en tant que document gratuit.

 Spécifications techniques

  • No. de tubes
  • 9
  • Principe général
  • Récepteur TRF - sans réaction (pas régénératif); 3 Etage(s) BF; Neutrodyne
  • Circuits accordés
  • 4 Circuits MA (AM)
  • Gammes d'ondes
  • PO uniquement
  • Tension / type courant
  • Alimentation Courant Alternatif (CA) / 90-130 Volt
  • Haut-parleur
  • HP dynamique à électro-aimant (électrodynamique)
  • Matière
  • Boitier métallique
  • De Radiomuseum.org
  • Modèle: Majestic Ch= 180 - Grigsby-Grunow -Hinds Co.
  • Forme
  • Chassis (pour intégration dans meuble)
  • Remarques

  • 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.

  • Source extérieure
  • Ernst Erb
  • Source du schéma
  • Rider's Perpetual, Volume 1 = 1931/1934 (for 1919-1931)

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