Model: SCR-638 BC-683
Antique radios, Old Time Radios
SCR-638 BC-683
Country:
United States of America (USA)
Manufacturer/Brand:
MILITARY U.S. (different makers for same model)
Year: 1942 – 1946 ??
Type:
Military communications equipment, mainly used for military communications in designated wavebands. Used or modified equipment or variants also used for radio amateur and civilian commercial communications.
Note, that some models are produced by several manifacturers and then can be found unter Manufacturer Military. In Radiomuseum we do not list military equipment not suitable for one or two way communication, e.g. radar, satellite or weapon electronics.Military Equipment
Mod.-ID = 85087
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Schematics etc.: 4 (for
members)
Principle
Superhet with a preamplification stage.
Please use «To add informations to model» if you know more! Thanks.
Récepteur TSF superhétérodyne avec préamplification de HF.
Superhet mit HF-Vorstufe.
Superhet with RF-stage; IF-Freq. 2650 kHz; 2 AF-stage(s)
Wave bands
Bitte geben Sie die Wellenbänder an, falls Sie mehr wissen.Wave Bands given in the notes.
Power type and voltage
Storage Battery for all / 12 or 24 Volt
Loudspeaker/pwr.out
Permanent magnet type moving coil speaker (principle by Rice-Kellog, without field excitation coil).
Haut-parleur avec système dynamique à aimant permanent (sans bobine d`excitation).
Permanentdynamischer Lautsprecher, also (modernes) Tauchspulenprinzip mit Selbsterregung bzw. Permanentmagnet statt Magnetspule. Siehe «Radios von gestern» Seiten 329ff.Permanent Magnet Dynamic (PDyn) Loudspeaker (moving coil)
/ 2 W
from Radiomuseum.org
Model: SCR-638 BC-683
Material
Metal case.
Caisse en métal.
Gerät, dessen Gehäuse aus Metall gefertigt ist. Es kann sich um verschiedenartige Metalle und Oberflächenbearbeitungen handeln. Ist es hingegen nur ein Chassis, so erhält das Gerät eine andere Bezeichnung.Metal case
Shape
Tablemodel, with any shape - general.
Dimensions (WHD)
170 x 295 x 320 mm / 6.7 x 11.6 x 12.6 inch
Valves / Tubes
10:
6AC7
(more
for members)
Notes
Range 27 - 38,9 MHz, ten channel presets, NBFM (Amstrong license). Needs dynamotor DM-34 (12 volts) or DM-36 (24 volts). Similar to BC-603 (20 - 28 MHz). Some slightly different variants. Basic component of WWII field artillery radio sets SCR-608 and SCR-628, matches transmitter BC-684. Tubes only one times listed.
This model was suggested by Anonymous 1 Collector.
Ausführung BC-683-B von 1944, Hersteller Western Electric, NY
zwei Empfänger BC-683-A, ein Sender BC-684-A, besitze das Manual, ggf. nachfragen
matching receiver in radio sets SCR-608-A / SCR-628-A, contact me for manual
More pictures
More information on
SCR-638 BC-683 (MILITARY U.S. (different makers for same model))
Hallo, I scanned the Service Manual for the SCR-608 / 628radio sets including the BC-683 receiver, i can be found for download at
ftp://bama.sbc.edu/downloads/miltest/scr608/
or on my personal website
http://www.dr-boesch.ch/radio/manual-liste.htm
Hope that helps Martin Boesch
