• Country
• United States of America (USA)

• Manufacturer / Brand
• Philco, Philadelphia Stg. Batt. Co.; USA

• 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.

• Number of Tubes
• 7

• Valves / Tubes
• 78 6A7 78 85 42 42 80

• 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

• Source of data
• The Radio Collector's Directory and Price Guide 1921 - 1965

• Circuit diagram reference
• Rider's Perpetual, Volume 6 = 1935 and before

• Mentioned in
• Philco Radio 1928-1942

• Literature/Schematics (1)
• Philco Service Bulletin # 221; Philco Wiring Diagrams, Parts Lists, and Essential Serv. Data 1928-36

• Literature/Schematics (2)
• Cathedral & Tombstone Radios (page 195.)

• Other Models

• Here you find 4041 models, 2217 with images and 3690 with schematics for wireless sets etc. In French: TSF for Télégraphie sans fil.
  All listed radios etc. from Philco, Philadelphia Stg. Batt. Co.; USA