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Magnetic Tape Recorder 731

Magnetic Tape Recorder 731; Ampro Corp.; Chicago (ID = 255361) R-Player
 
Magnetic Tape Recorder 731; Ampro Corp.; Chicago (ID = 280876) R-Player
 
Magnetic Tape Recorder 731; Ampro Corp.; Chicago (ID = 280877) R-Player
 
Magnetic Tape Recorder 731; Ampro Corp.; Chicago (ID = 280878) R-Player
 
Magnetic Tape Recorder 731; Ampro Corp.; Chicago (ID = 280879) R-Player
 
Magnetic Tape Recorder 731; Ampro Corp.; Chicago (ID = 280880) R-Player
 
Magnetic Tape Recorder 731; Ampro Corp.; Chicago (ID = 280881) R-Player
 
Magnetic Tape Recorder 731; Ampro Corp.; Chicago (ID = 280882) R-Player
 
Magnetic Tape Recorder 731; Ampro Corp.; Chicago (ID = 280883) R-Player
 
Magnetic Tape Recorder 731; Ampro Corp.; Chicago (ID = 280884) R-Player
Magnetic Tape Recorder 731; Ampro Corp.; Chicago (ID = 837550) R-Player Magnetic Tape Recorder 731; Ampro Corp.; Chicago (ID = 433859) R-Player
Magnetic Tape Recorder 731; Ampro Corp.; Chicago (ID = 828286) R-Player Magnetic Tape Recorder 731; Ampro Corp.; Chicago (ID = 828290) R-Player
Magnetic Tape Recorder 731; Ampro Corp.; Chicago (ID = 828291) R-Player Magnetic Tape Recorder 731; Ampro Corp.; Chicago (ID = 828292) R-Player
Magnetic Tape Recorder 731; Ampro Corp.; Chicago (ID = 837545) R-Player Magnetic Tape Recorder 731; Ampro Corp.; Chicago (ID = 837551) R-Player
Magnetic Tape Recorder 731; Ampro Corp.; Chicago (ID = 989464) R-Player Magnetic Tape Recorder 731; Ampro Corp.; Chicago (ID = 1112189) R-Player
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Magnetic Tape Recorder 731; Ampro Corp.; Chicago (ID = 837550) R-Player
Ampro Corp.; Chicago: Magnetic Tape Recorder 731 [R-Player] ID = 837550 900x600
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For model Magnetic Tape Recorder 731, Ampro Corp.; Chicago (IL)
 
Country:  United States of America (USA)
Manufacturer / Brand:  Ampro Corp.; Chicago (IL)
Year: 1951/1952 Type: Recorder and/or Player
Valves / Tubes 4: 12AX7 6AU6 6AQ5 6X4
Principle Audio-Amplification
Wave bands - without
Details Tape Recorder
Power type and voltage Alternating Current supply (AC) / 105-120 Volt
Loudspeaker Permanent Magnet Dynamic (PDyn) Loudspeaker (moving coil)
Power out 3 W (unknown quality)
from Radiomuseum.org Model: Magnetic Tape Recorder 731 - Ampro Corp.; Chicago IL
Material Leather / canvas / plastic - over other material
Dimensions (WHD) 300 x 260 x 200 mm / 11.8 x 10.2 x 7.9 inch
Notes
The Model 731 from Ampro Corp in Chicago (IL) is a Magnetic Tape Recorder ans Playback Unit. The 12AX7 is selected. For mechanical unit service
see also model 730
Photofact set 133, folder 4. The model 731 has an Ext. Speaker Jack besides the inbuilt speaker.
Este modelo tiene una sola velocidad (3 3/4), carretes max. 7", 2 cabezas grabación/reproducción, borrado por imán permanente monoaural y un sólo canal, un motor, respuesta a frecuencia: 50Hz-6kHz, relación señal/ruido 42 db.
Net weight (2.2 lb = 1 kg) 7 kg / 15 lb 6.7 oz (15.419 lb)
Price in first year of sale 96,000.00 francs
Collectors' prices  
External source of data Ernst Erb
Circuit diagram reference Rider's Perpetual, Volume 22, covering 1951
Literature/Schematics (1) Photofact Folder, Howard W. SAMS (Date 5-52, set 166, folder 5)

All listed radios etc. from Ampro Corp.; Chicago (IL)
Here you find 11 models, 8 with images and 5 with schematics.


  
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