• Country
• United States of America (USA)

• Manufacturer / Brand
• Edison, Thomas A., North American Phonograph / National Phonograph; Orange, NJ

• Year
• 1929

• Category
• Broadcast Receiver - or past WW2 Tuner

• Radiomuseum.org ID
• 38006

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

• Number of Tubes
• 8

• Valves / Tubes
• 27 27 27 27 27 45 45 80

• Main principle
• TRF without regeneration; Neutrodyne

• Tuned circuits
• 4 AM circuit(s)

• Wave bands
• Broadcast only (MW).

• Power type and voltage
• Alternating Current supply (AC) / 110 Volt

• Loudspeaker
• Electro Magnetic Dynamic LS (moving-coil with field excitation coil)

• Material
• Wooden case

• from Radiomuseum.org
• Model: R-4 Ch= 7R + 8P - Edison, Thomas A., North

• Shape
• Console, Highboy (legs > 50 %).

• Notes
• One dial (primary tuning control knob) ; push-pull af output stage; Model "R4" is a combination of the receiver unit "7R" and the power unit "8P"; model "R4" also incorporates the "Light-O-Matic" dial drive mechanism.
  4 legged console with stretcher base.

• Price in first year of sale
• 215.00 $

• External source of data
• Ernst Erb

• Source of data
• Radio Collector`s Guide 1921-1932

• Circuit diagram reference
• Rider's Perpetual, Volume 1 = 1931/1934 (for 1919-1931)

• Mentioned in
• The Radio Collector's Directory and Price Guide 1921 - 1965

• Literature/Schematics (1)
• Pre-War Consoles

• Other Models

• Here you find 90 models, 72 with images and 36 with schematics for wireless sets etc. In French: TSF for Télégraphie sans fil.
  All listed radios etc. from Edison, Thomas A., North American Phonograph / National Phonograph; Orange, NJ