Majestic Ch= 180

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

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  • Anno
  • 1928
  • Categoria
  • Radio (o sintonizzatore del dopoguerra WW2)
  • Radiomuseum.org ID
  • 43607

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 Specifiche tecniche

  • Numero di tubi
  • 9
  • Principio generale
  • A circuiti accordati (amplif. diretta) senza reazione; 3 Stadi BF; Neutrodina (con neutrocondensatore)
  • N. di circuiti accordati
  • 4 Circuiti Mod. Amp. (AM)
  • Gamme d'onda
  • Solo onde medie (OM).
  • Tensioni di funzionamento
  • Alimentazione a corrente alternata (CA) / 90-130 Volt
  • Altoparlante
  • AP elettrodinamico (bobina mobile e bobina di eccitazione/di campo)
  • Materiali
  • Mobile di metallo
  • Radiomuseum.org
  • Modello: Majestic Ch= 180 - Grigsby-Grunow -Hinds Co.
  • Forma
  • Chassis o in scatola da montaggio
  • Annotazioni

  • 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.

  • Fonte esterna dei dati
  • Ernst Erb
  • Riferimenti schemi
  • Rider's Perpetual, Volume 1 = 1931/1934 (for 1919-1931)

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