Majestic 91 Ch= 90-B (or 90)

• Paese
• USA (Stati Uniti d'America)

• Produttore / Marca
• Grigsby-Grunow (-Hinds) Co. (Majestic pre 1933); Chicago (IL)

• Anno
• 1929/1930

• Categoria
• Radio (o sintonizzatore del dopoguerra WW2)

• Radiomuseum.org ID
• 97796

• Immagini
• Schemi

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• Numero di tubi
• 8

• Valvole
• 27 27 27 27 27 45 45 80

• Principio generale
• A circuiti accordati (amplif. diretta) senza reazione; 1 Stadi BF; Neutrodina (con neutrocondensatore)

• N. di circuiti accordati
• 5 Circuiti Mod. Amp. (AM)

• Gamme d'onda
• Solo onde medie (OM).

• Tensioni di funzionamento
• Alimentazione a corrente alternata (CA) / Adjustment plate for 105, 115 and 125 Volt

• Altoparlante
• AP elettrodinamico (bobina mobile e bobina di eccitazione/di campo) / Ø 10 inch = 25.4 cm

• Materiali
• Mobile in legno

• Radiomuseum.org
• Modello: Majestic 91 Ch= 90-B - Grigsby-Grunow -Hinds Co.

• Forma
• Console, con gambe d'appoggio basse (< 50%).

• Annotazioni

• The "Majestic 91" has an "Early English style cabinet" with stretcher base. It was made with two slightly different chassis outfits, the chassis 90 or the chassis 90-B.
  The chassis 90 uses separate Power Supply 9P3 or 9P6. THe Chassis 90-B has an integral Power Supply. This is one of the models using the chassis 90-B - often incorrectly named model Majestic 90-B. The chassis 90-B comes for 50-60 cycles or 25-40 cycles AC. Reason: There are two different values for the power supply: 3 condensers for 2 MF or two of them for 4 MF (for 25-40 cycles). For the antenna there is a local distance switch.
  
  The chassis 90 and 90-B from Grigsby-Grunow Co. have a 5 gang variable condensator for tuning the T.R.F. balanced circuit with a single control. The selectivity control or trimmer functions by varying the inductance of the antenna input coil and permits adjusting the input circuit to exact resonance with the other tuned circuits. The detector tube feeds (via R.F. choke) directly the transformer for the push-pull output which drive the so called "Super-Dynamic Speaker" model G-3 from Grigsby-Grunow Company in Chicago. The models Majestic 90, Majestic 91 and Majestic 93 with its different cases use the same chassis 90-B, while chassis 90 is used in console models 91 and 92. This model 91 here is the only one where both chassis versions were applied. Since there is no way to tell from pictures which version found use, we decided (as an exception) to mention both chassis in one model together.

  Note also that the pictures currently associated with this model have some differences in cabinet style.

• Prezzo nel primo anno
• 137.50 $

• Fonte dei dati
• Pre-War Consoles

• Riferimenti schemi
• Rider's Perpetual, Volume 1 = 1931/1934 (for 1919-1931)

• Bibliografia
• The Radio Collector's Directory and Price Guide 1921 - 1965

• Letteratura / Schemi (1)
• Beitman Radio Diagrams, Vol. 01, 1926-1938

• Letteratura / Schemi (2)
• Radio Broadcast, Apr 1930, p. 354

• Autore
• Modello inviato da Walter Wiesmüller † May 2012. Utilizzare "Proponi modifica" per inviare ulteriori dati.

• Altri modelli

• In questo link sono elencati 201 modelli, di cui 122 con immagini e 157 con schemi.
  Elenco delle radio e altri apparecchi della Grigsby-Grunow (-Hinds) Co. (Majestic pre 1933); Chicago (IL)