• País
• Estados Unidos

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

• Año
• 1928/1929

• Categoría
• Radio - o Sintonizador pasado WW2

• Radiomuseum.org ID
• 43681

Haga clic en la miniatura esquemática para solicitarlo como documento gratuito.

• Numero de valvulas
• 8

• Válvulas
• UX226 UX226 UX226 UY227 UX226 UX171A UX171A UX280 or CX380

• Principio principal
• RFS sin reacción; Neutrodyne

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

• Gama de ondas
• OM (onda media) solamente

• Tensión de funcionamiento
• Red: Corriente alterna (CA, Inglés = AC) / 90-130 Volt

• Altavoz
• Altavoz electrodinámico (bobina de campo)

• Material
• Madera

• de Radiomuseum.org
• Modelo: Majestic 71 Ch= 70-B [Late] - Grigsby-Grunow -Hinds Co.

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

• Anotaciones

• Push-pull af output stage; using the 7BP6 or 7BP3 power unit.

  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 C_ag Miller-capacitance, in effect neutralising the triode tendency to oscillate.

  This is the late version of Majestic model 71 from 1929 and later. See also the early version from 1928 with quite a different housing and chassis version 7A. We have found a picture of this later version as a low boy but are not sure if there is also a high boy with chassis version 7B - and vice versa. The difference can be seen on the plate: There you find the chassis Majestic 7, model 70 in the version 7A. This set and the early version have a push-pull output stage using two 171 power tubes. The Majestic 71 is made of walnut with burl walnut front panels and came with a Majestic electric power unit and Majestic dynamic power speaker.

• Precio durante el primer año
• 137.50 $

• Ext. procedencia de los datos
• Ernst Erb

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

• Documentación / Esquemas (1)
• Beitman Radio Diagrams, Vol. 01, 1926-1938 (Rider's Perpetual, Volume 2 = 1932 and before)

• Documentación / Esquemas (2)
• The Grigsby-Grunow Co. Folder "Electric Radios" for Majestic.

• Otros modelos

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