Sparton 4940TV
Sparks-Withington Co., (Sparton); Jackson, Michigan
- País
- Estados Unidos
- Fabricante / Marca
- Sparks-Withington Co., (Sparton); Jackson, Michigan
- Año
- 1949
- Categoría
- Televisión (TV) o monitor
- Radiomuseum.org ID
- 125155
SAMS Photofact Folder 4912-11 6/49
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- Numero de valvulas
- 37
- Válvulas
- 6BH6 6AG5 6C4 6BH6 6BH6 6BH6 6BH6 6AL5 6AU6 6AK6 6AL5 6AU6 6AU6 6AU6 6AL5 6AT6 6V6 6J6 6SN7 6V6 6AL5 12AU7 6L6 5V4 6SN7 1B3 5U4 6BA6 6BE6 7A7 7AG7 7AG7 7AG7 6AL5 7B6 7B5 5Y3 10BP4
- Principio principal
- Superheterodino en general
- Gama de ondas
- Bandas de recepción puestas en notas.
- Tensión de funcionamiento
- Red: Corriente alterna (CA, Inglés = AC) / 117 Volt
- Altavoz
- 2 Altavoces / Ø 9.5 inch = 24.1 cm
- Material
- Madera
- de Radiomuseum.org
- Modelo: Sparton 4940TV - Sparks-Withington Co., Sparton
- Forma
- Consola en general
- Ancho, altura, profundidad
- 26 x 32 x 15 inch / 660 x 813 x 381 mm
- Anotaciones
- 10 " mirror-in-lid b/w TV with US standard VHF tuner, mahogany. Channels 2 through 13
- Procedencia de los datos
- Photofact Folder, Howard W. SAMS
- Mencionado en
- Volume 7 Set #64 Folder 4912-11 06/1949
- Autor
- Modelo creado por un miembro de A. Ver en "Modificar Ficha" los participantes posteriores.
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Contribuciones en el Foro acerca de este modelo: Sparks-Withington Co: Sparton 4940TV
Hilos: 1 | Mensajes: 2
I have this model set and it did operate when I bought it 30 some odd years ago but had a very dim picture. The neat thing about this TV was that the displayed picture was a reverse image so it looked normal when viewed through the mirror in the lid. Anyhow, I finally replaced all the paper and electrolytic capacitors and now there is no raster. I suspect problem is in the high frequency H.V. Power supply. It consists of a 6SN7 hooked up for parallel operation of a oscillator tuned to about 300khz feeding into primary of the high voltage transformer which has a secondary consisting of multiple separated windings to minimize corona discharge. The power supply appears to be operating correctly but the resistance reading of the secondary is about 560 ohms and that seemed a little high. Does anyone know much about these long forgotten H.V. Power supplies used in early TV or have any info about this particular set? Any insight would be appreciated.
Gregory Jones, 09.Jul.15