• País
• Estados Unidos

• Fabricante / Marca
• Philco, Philadelphia Stg. Batt. Co.; USA

• Año
• 1936

• Categoría
• Radio - o Sintonizador pasado WW2

• Radiomuseum.org ID
• 141805

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

• Numero de valvulas
• 15

• Válvulas
• 78 6B7 76 78 78 78 85 85 85 6F7 42 6A3 6A3 5Z3 80

• Principio principal
• Superheterodino con paso previo de RF; ZF/IF 460 kHz

• Gama de ondas
• OM, OL y dos OC

• Tensión de funcionamiento
• Red: Corriente alterna (CA, Inglés = AC) / 115 Volt

• Altavoz
• Altavoz electrodinámico (bobina de campo)

• Potencia de salida
• 20 W (unknown quality)

• Material
• Madera

• de Radiomuseum.org
• Modelo: 680X [Late] - Philco, Philadelphia Stg. Batt

• Forma
• Consola en general

• Anotaciones
• The Philco model 680X is an elaborate 15-tube 4-band high fidelity radio. It has the highest output power of any of Philco's radios up to 1936, with a push-pull class A triode output stage using two 6A3 triodes driven by a 42 pentode. In addition to the 5Z3 rectifier for the B+, there is a second rectifier using a type 80 tube to provide fixed negative bias to the output tubes.
  
  Other features for high fidelity include the use of passive radiator speakers (called "Acoustic Clarifiers") in addition to the main driven speaker, a separate bass amplifier stage using a 6F7 tube, and variable coupling in all three IF transformers to trade off selectivity versus high frequency audio response.
  
  Other notable features of the circuitry include two IF stages, separate oscillator and mixer tubes, use of an amplified AVC, and a dedicated tube and separate IF transformer for providing the signal to the shadow meter.
  
  The early version (1935) of the 680X has the controls under a lid on the top of the cabinet. The late version (1936) has a more conventional appearance with the controls on the front of the cabinet.

• Precio durante el primer año
• 275.00 $

• Procedencia de los datos
• Philco Radio 1928-1942

• Referencia esquema
• Rider's Perpetual, Volume 7 = 1936 and before

• Documentación / Esquemas (1)
• Philco Service Bulletin # 228; Philco Wiring Diagrams, Parts Lists, and Essential Serv. Data 1928-36

• Documentación / Esquemas (2)
• Pre-War Consoles

• Autor
• Modelo creado por Thomas Albrecht. Ver en "Modificar Ficha" los participantes posteriores.

• Otros modelos

• Donde encontrará 4019 modelos, 2215 con imágenes y 3667 con esquemas.
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