• Paese
• USA (Stati Uniti d'America)

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

• Anno
• 1933

• Categoria
• Radio (o sintonizzatore del dopoguerra WW2)

• Radiomuseum.org ID
• 51170

Clicca sulla miniatura dello schema per richiederlo come documento gratuito.

• Numero di tubi
• 4

• Valvole
• 77 77 42 80

• Principio generale
• Supereterodina (in generale); ZF/IF 460 kHz; Supereterodina con reazione non regolabile

• Gamme d'onda
• Onde medie (OM) e tropicali/polizia (150-200m).

• Tensioni di funzionamento
• Alimentazione a corrente alternata (CA) / 115 Volt

• Altoparlante
• AP elettrodinamico (bobina mobile e bobina di eccitazione/di campo)

• Materiali
• Mobile in legno

• Radiomuseum.org
• Modello: 81Junior [Late ] - Philco, Philadelphia Stg. Batt

• Forma
• Soprammobile a cattedrale o cupola (upright, round top or pinted arch, not rounded edges only).

• Dimensioni (LxAxP)
• 12 x 14 x 8 inch / 305 x 356 x 203 mm

• Annotazioni

• 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.
  
  There was an early version with four controls by 3 knobs (separate controls for tuning, band, power, and volume) and this later version with three controls by 2 knobs (power and volume combined).

  There was also an export chassis version 81F (or possibly 81E) for 220 V power.

• Prezzo nel primo anno
• 19.00 $

• Fonte esterna dei dati
• Ernst Erb

• Fonte dei dati
• Collector's Guide to Antique Radios 4. Edition

• Riferimenti schemi
• Rider's Perpetual, Volume 3 = 1933 and before

• Bibliografia
• Guide to Old Radios (Philco Radio 1928-1942 (Ramirez))

• Letteratura / Schemi (1)
• Rider's Perpetual, Volume 8 = 1937 and before (Philco 1928-36 Wiring Diagrams, Parts Lists, and Essential Service Data)

• Altri modelli

• In questo link sono elencati 4019 modelli, di cui 2215 con immagini e 3667 con schemi.
  Elenco delle radio e altri apparecchi della Philco, Philadelphia Stg. Batt. Co.; USA