643B Late

Philco, Philadelphia Stg. Batt. Co.; USA

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  • Year
  • 1936
  • Category
  • Broadcast Receiver - or past WW2 Tuner
  • Radiomuseum.org ID
  • 141742

Click on the schematic thumbnail to request the schematic as a free document.

 Technical Specifications

  • Number of Tubes
  • 7
  • Main principle
  • Superhet with RF-stage; ZF/IF 460 kHz
  • Wave bands
  • Broadcast, Long Wave and 2 x Short Wave.
  • Power type and voltage
  • Storage and/or dry batteries / 135, 67.5, 2, -3 & -7.5 Volt
  • Loudspeaker
  • Permanent Magnet Dynamic (PDyn) Loudspeaker (moving coil)
  • Material
  • Wooden case
  • from Radiomuseum.org
  • Model: 643B [Late] - Philco, Philadelphia Stg. Batt
  • Shape
  • Tablemodel, Tombstone = decorative upright, not cathedral but can have rounded edges.
  • Notes
  • The Philco 643 series is based on a 7-tube battery-powered 4-band chassis (150-390 kHz, BC, 1.75-5.8 MHz, and 5.8-18 MHz). The standard 643 chassis uses a 2 volt A supply; the 643A chassis uses a dry A battery (presumably 3 V) and a type 1C1 ballast tube in series with the A supply to lower the tube filament voltage to 2 V.

    There are three models with different cabinet styles: The early version (1935) of model 643B is a shouldered tombstone; the late version (1936) of 643B is simpler tombstone design with a slightly trapezoidal shape. Model 643X (1935-36) is a floor-type console.
  • Price in first year of sale
  • 80.00 $
  • Circuit diagram reference
  • Rider's Perpetual, Volume 7 = 1936 and before
  • Literature/Schematics (1)
  • Philco 1928-36 Wiring Diagrams, Parts Lists, and Essential Service Data
  • Author
  • Model page created by Thomas Albrecht. See "Data change" for further contributors.

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