643B Early

643B ; Philco, Philadelphia (ID = 536139) Radio
643B ; Philco, Philadelphia (ID = 536140) Radio
643B ; Philco, Philadelphia (ID = 1488776) Radio 643B ; Philco, Philadelphia (ID = 1488777) Radio
643B ; Philco, Philadelphia (ID = 1488778) Radio
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643B ; Philco, Philadelphia (ID = 1488776) Radio
Philco, Philadelphia: 643B [Radio] ID = 1488776 743x600
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For model 643B Early, Philco, Philadelphia Stg. Batt. Co.; USA:
Cabinet, knobs, cloth in original condition. Shown with two reproduction batteries connected that are cosmetically similar to the originals.
Country:  United States of America (USA)
Manufacturer / Brand:  Philco, Philadelphia Stg. Batt. Co.; USA
Year: 1935 Category: Broadcast Receiver - or past WW2 Tuner
Valves / Tubes 7: 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)
Power out
from Model: 643B [Early] - Philco, Philadelphia Stg. Batt
Material Wooden case
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

All listed radios etc. from Philco, Philadelphia Stg. Batt. Co.; USA
Here you find 3737 models, 2110 with images and 3134 with schematics for wireless sets etc. In French: TSF for Télégraphie sans fil.