NR-7

• Country
• United States of America (USA)

• Manufacturer / Brand
• Freed-Eisemann Radio Corp.; New York, NY

• Year
• 1925

• Category
• Broadcast Receiver - or past WW2 Tuner

• Radiomuseum.org ID
• 41000

• Picture
• Schematics

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

• Number of Tubes
• 6

• Valves / Tubes
• UX201A UX201A UX201A UX201A UX201A UX201A or UX112

• Main principle
• TRF without regeneration; 2 AF stage(s); Neutrodyne

• Tuned circuits
• 3 AM circuit(s)

• Wave bands
• Broadcast only (MW).

• Power type and voltage
• Storage and/or dry batteries

• Loudspeaker
• - For headphones or amp.

• Material
• Wooden case

• from Radiomuseum.org
• Model: NR-7 - Freed-Eisemann Radio Corp.;

• Shape
• Tablemodel, Box - most often with Lid (NOT slant panel).

• Notes
• If UX201A's are used in the output stage, use both stages in parallel. If a power tube is used, one tube in either 2nd A.F. socket is sufficient. The radio is clearly from 1925 (ad), hence the Riders tube lineup is for service only.

• Price in first year of sale
• 110.00 $

• 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
• Collector's Guide to Antique Radios 4. Edition

• Literature/Schematics (1)
• Radio Manufacturers of the 1920's, Vol. 2 (p.10)

• Other Models

• Here you find 205 models, 106 with images and 128 with schematics for wireless sets etc. In French: TSF for Télégraphie sans fil.
  All listed radios etc. from Freed-Eisemann Radio Corp.; New York, NY