90 Baby Grand Middle

Philco, Philadelphia Stg. Batt. Co.; USA

Datos
Foro
Imágenes
Colecciones

  • Año
  • 1931
perfect model
  • Categoría
  • Radio - o Sintonizador pasado WW2
  • Radiomuseum.org ID
  • 18816

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

 Especificaciones técnicas

  • Numero de valvulas
  • 9
  • Principio principal
  • Superheterodino con paso previo de RF; ZF/IF 175 kHz
  • Número de circuitos sintonía
  • 7 Circuíto(s) AM
  • Gama de ondas
  • OM (onda media) solamente
  • Tensión de funcionamiento
  • Red: Corriente alterna (CA, Inglés = AC) / 50 to 60 cycles, 115 Volt
  • Altavoz
  • Altavoz electrodinámico (bobina de campo)
  • Material
  • Madera
  • de Radiomuseum.org
  • Modelo: 90 Baby Grand [Middle] - Philco, Philadelphia Stg. Batt
  • Forma
  • Sobremesa tipo Capilla (upright, round top or pinted arch, not rounded edges only).
  • Ancho, altura, profundidad
  • 0 x 18 x 0 inch / 0 x 457 x 0 mm
  • Anotaciones

  • Models 90 and 90A were available in a cathedral, a lowboy, and a highboy cabinet. The chassis was made in three versions - an early model 90 and 90A with two 45 output tubes in push-pull, a middle version with one 47 output tube, and a late version with two 47 output tubes. Model 90 is for 115 VAC 50-60 Hz; model 90A is for 115 VAC 25-60 Hz.

    The models 90 and 90A "early" and "middle" have a 4-gang tuning condenser plus 3 tuned IF circuit - both with IF 175 (Rider's change note 8-3). The version "middle", which are above serial number 237,001, of the model 90 and 90A has tubes: 24 RF, 27 osc, 24 1st det., 24 IF, 27 2nd det. rect., 27 det. amp., 27 1st AF amp, 47 output and 80 rectifier. The "late" model 90 and 90A again have push-pull output but with 2 x 47 tubes. See Rider's Philco 3-35 for IF 260 kHz. Applied on models serial B-32001 to B-35000 and above B-53100. They have a 3-gang tuning condenser and only 6 tuned circuits. The same differences can be found for all cabinets, both 90 and 90A: Baby Grand (Cathedral), Lowboy and Highboy (with a stretcher).

    The cathedral cabinet is the classic design by Edward L. Coombs, and is similar to the cathedral versions of model 21, 35, 46, and 70. [3331438-1133]

  • Precio durante el primer año
  • 69.00 $
  • Ext. procedencia de los datos
  • E. Erb 3-907007-36-0
  • Referencia esquema
  • Die «Thali Schemasammlung» führt das Modell.
  • Documentación / Esquemas (3)
  • Philco Folder 2674.

 Colecciones | Museos | Literatura

Colecciones

El modelo 90 es parte de las colecciones de los siguientes miembros.

 Forum

Contribuciones en el Foro acerca de este modelo: Philco, Philadelphia: 90 Baby Grand

Hilos: 2 | Mensajes: 8

What does the open circle and filled in square mean on a scematic? See attached

The radio I'm working on (Philco Model 90 Middle) has two capacitors on each leg of the incoming AC power going to ground. Are they necessary? It seems to me to be an accident waiting to happen. See attached

Anexos

James Hochstetler, 05.Jan.22

Weitere Posts (4) zu diesem Thema.

First of all I'm a beginner to radio restoration. My question is on the capacitors packed inside the two metal containers 24 and 30. 24 says it has 4 capacitors inside but only has 3 leads exiting the container. 30 say it has two capacitors inside but has 3 leads exiting the container. On the schematic it shows 24, 4 (four) times but no values listed. 30 shows up twice but again no value. The values are different on all 6 capacitors so how do I know which one goes where? Am I missing something? One more question on polarity of the two electrolytics, 56 and 57. The schematic does not indicate polarity. My intuition says + for 56 goes to the choke 55. On 57, negative generally goes to ground. Any thoughts or help would be appreciated.

P.S. Am I the only one that doesn't like codes inside a circle rather than the actual value?

James Hochstetler, 01.Dec.21

Weitere Posts (4) zu diesem Thema.