• 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
• 51116

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

• Number of Tubes
• 7

• Valves / Tubes
• 34 1C6 34 30 32 30 19 1C1_ballast

• 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 [Early] - 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 $

• External source of data
• Ernst Erb

• Circuit diagram reference
• Rider's Perpetual, Volume 7 = 1936 and before

• Mentioned in
• Philco Radio 1928-1942

• Literature/Schematics (1)
• Philco 1928-36 Wiring Diagrams, Parts Lists, and Essential Service Data

• Literature/Schematics (2)
• Ballast Tube Handbook, The

• Other Models

• Here you find 4006 models, 2205 with images and 3656 with schematics for wireless sets etc. In French: TSF for Télégraphie sans fil.
  All listed radios etc. from Philco, Philadelphia Stg. Batt. Co.; USA