81B (81, 81F) Junior Export (220 V)

Philco, Philadelphia Stg. Batt. Co.; USA

Dati
Forum
Immagini
Collezioni

  • Anno
  • 1933
perfect model
  • Categoria
  • Radio (o sintonizzatore del dopoguerra WW2)
  • Radiomuseum.org ID
  • 129468

Clicca sulla miniatura dello schema per richiederlo come documento gratuito.

 Specifiche tecniche

  • Numero di tubi
  • 4
  • Principio generale
  • Supereterodina (in generale); ZF/IF 460 kHz; Supereterodina con reazione non regolabile
  • N. di circuiti accordati
  • 3 Circuiti Mod. Amp. (AM)
  • Gamme d'onda
  • Onde medie (OM) e tropicali/polizia (150-200m).
  • Tensioni di funzionamento
  • Alimentazione a corrente alternata (CA) / 220 Volt
  • Altoparlante
  • AP elettrodinamico (bobina mobile e bobina di eccitazione/di campo) / Ø 15 cm = 5.9 inch
  • Materiali
  • Mobile in legno
  • Radiomuseum.org
  • Modello: 81B Junior [Export ] - Philco, Philadelphia Stg. Batt
  • Forma
  • Soprammobile a cattedrale o cupola (upright, round top or pinted arch, not rounded edges only).
  • Annotazioni

  • This is an export chassis 81F (or possibly 81E) for 220 V power. Unknown if early or late.

    The domestic models were either in an early version with four controls by 3 knobs (separate controls for tuning, band, power, and volume) or in a later version with three controls by 2 knobs (power and volume combined).

    The 80 series models (models 80, 81, and 84) were referred to as "Philco Junior" and were inexpensive entry-level radios employing a superheterodyne circuit with a regenerative stage to increase gain in the absence of an IF amplifier stage.

    Model 81B is a cathedral with a simple flat-front cabinet. An improvement it offered over the previous model 80B is the inclusion of a second band (police band, 1.5 - 2.8 MHz) with a very simple circuit, in which the oscillator tunes the same range for both bands, and only the front-end RF coil is switched, resulting in the second band being shifted upward in frequency by 920 kHz (twice the IF frequency of 460 kHz). The dial range is extended to accommodate the additional span of the police band.

  • Peso netto
  • 5.5 kg / 12 lb 1.8 oz (12.115 lb)
  • Riferimenti schemi
  • Rider's Perpetual, Volume 3 = 1933 and before
  • Letteratura / Schemi (1)
  • - - Manufacturers Literature (Philco 1928-36 Wiring Diagrams, Parts Lists, and Essential Service Data)
  • Autore
  • Modello inviato da Nigel Hulse. Utilizzare "Proponi modifica" per inviare ulteriori dati.

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