Majestic 91 Ch= 90-B (or 90)

• País
• Estados Unidos

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

• Año
• 1929/1930

• Categoría
• Radio - o Sintonizador pasado WW2

• Radiomuseum.org ID
• 97796

• Imágenes
• Esquemas

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• Numero de valvulas
• 8

• Válvulas
• 27 27 27 27 27 45 45 80

• Principio principal
• RFS sin reacción; 1 Etapas de AF; Neutrodyne

• Número de circuitos sintonía
• 5 Circuíto(s) AM

• Gama de ondas
• OM (onda media) solamente

• Tensión de funcionamiento
• Red: Corriente alterna (CA, Inglés = AC) / Adjustment plate for 105, 115 and 125 Volt

• Altavoz
• Altavoz electrodinámico (bobina de campo) / Ø 10 inch = 25.4 cm

• Material
• Madera

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

• Forma
• Consola baja, patas más cortas del 50%.

• Anotaciones

• 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.

• Precio durante el primer año
• 137.50 $

• Procedencia de los datos
• Pre-War Consoles

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

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

• Documentación / Esquemas (1)
• Beitman Radio Diagrams, Vol. 01, 1926-1938

• Documentación / Esquemas (2)
• Radio Broadcast, Apr 1930, p. 354

• Autor
• Modelo creado por Walter Wiesmüller † May 2012. Ver en "Modificar Ficha" los participantes posteriores.

• Otros modelos

• Donde encontrará 201 modelos, 122 con imágenes y 157 con esquemas.
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