• Country
• United States of America (USA)

• Manufacturer / Brand
• United Air Cleaner Corp. - see also Sentinel

• Year
• 1931

• Category
• Broadcast Receiver - or past WW2 Tuner

• Radiomuseum.org ID
• 63931

• • Brand: Sentinel

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

• Number of Tubes
• 4

• Valves / Tubes
• 35 24 47 80

• Main principle
• TRF without regeneration

• Tuned circuits
• 3 AM circuit(s)

• Wave bands
• Broadcast only (MW).

• Power type and voltage
• Alternating Current supply (AC)

• Loudspeaker
• Permanent or electro-dynamic (moving coil), system not known yet.

• Material
• Wooden case

• from Radiomuseum.org
• Model: 111 [4 tubes] - United Air Cleaner Corp. - see

• Shape
• Table-Cathedral-Type (upright, round top or gothic arch, not rounded edges only).

• Price in first year of sale
• 37.00 $

• External source of data
• Ernst Erb

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

• Circuit diagram reference
• Rider's Perpetual, Volume 2 = 1932 (Models 1931/1932)

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

• Literature/Schematics (1)
• Collector's Guide to Antique Radios (6th edition)

• Other Models

• Here you find 43 models, 11 with images and 25 with schematics for wireless sets etc. In French: TSF for Télégraphie sans fil.
  All listed radios etc. from United Air Cleaner Corp. - see also Sentinel