• Year
  • 1935
  • Category
  • Broadcast Receiver - or past WW2 Tuner
  • Radiomuseum.org ID
  • 51113

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
  • Tuned circuits
  • 7 AM circuit(s)
  • Wave bands
  • Broadcast, Long Wave and 2 x Short Wave.
  • Power type and voltage
  • Alternating Current supply (AC) / 115 Volt
  • Loudspeaker
  • Electro Magnetic Dynamic LS (moving-coil with field excitation coil)
  • Power out
  • 7 W (unknown quality)
  • Material
  • Wooden case
  • from Radiomuseum.org
  • Model: 640B - Philco, Philadelphia Stg. Batt
  • Shape
  • Tablemodel, Tombstone = decorative upright, not cathedral but can have rounded edges.
  • Notes
  • The Philco model 640 series uses a 7-tube 4-band chassis with shadow meter (tuning aid). The bands covered are 145-390 kHz, 540-1720 kHz, 2.2-2.6 MHz, and 5.8-18 MHz.

    There are four individual models with different cabinet styles. Model 640B is a shouldered tombstone. The 640X floor-type console has two versions - an early version having a vase-shaped pattern in the lattice work over the speaker, and a late version having three vertical bars in front of the speaker. Model 640PF is a radio-phonograph console with the phonograph under the top cover.

    The model 645 series (1936) is electrically very similar, as is the 37-640 series (1936-37), although the latter series has updated tubes and different band coverage.

    Stein mentions this model as a two bands radio.

  • Price in first year of sale
  • 70.00 $
  • External source of data
  • Ernst Erb
  • Circuit diagram reference
  • Rider's Perpetual, Volume 6 = 1935 and before
  • Literature/Schematics (1)
  • Philco Service Bulletin # 221; Philco Wiring Diagrams, Parts Lists, and Essential Serv. Data 1928-36

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The model 640B is part of the collections of the following members.

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