81(B) Junior Late (2 knobs)

Philco, Philadelphia Stg. Batt. Co.; USA

  • Année
  • 1933
perfect model
  • Catégorie
  • Radio - ou tuner d'après la guerre 1939-45
  • Radiomuseum.org ID
  • 51170

Cliquez sur la vignette du schéma pour le demander en tant que document gratuit.

 Spécifications techniques

  • No. de tubes
  • 4
  • Principe général
  • Super hétérodyne (en général); FI/IF 460 kHz; Super, Réaction non réglable.
  • Gammes d'ondes
  • PO et Police / Maritime (150-200m)
  • Tension / type courant
  • Alimentation Courant Alternatif (CA) / 115 Volt
  • Haut-parleur
  • HP dynamique à électro-aimant (électrodynamique)
  • Matière
  • Boitier en bois
  • De Radiomuseum.org
  • Modèle: 81Junior [Late ] - Philco, Philadelphia Stg. Batt
  • Forme
  • Modèle de table vertical cathédrale (dessus arrondi)
  • Dimensions (LHP)
  • 12 x 14 x 8 inch / 305 x 356 x 203 mm
  • Remarques
  • 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.

  • Prix de mise sur le marché
  • 19.00 $
  • Source extérieure
  • Ernst Erb
  • Source du schéma
  • Rider's Perpetual, Volume 3 = 1933 and before

 Collections | Musées | Littérature

Collections

Le modèle 81(B) fait partie des collections des membres suivants.

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