• Country
• United States of America (USA)

• Manufacturer / Brand
• Ozarka Inc.; Chicago

• Year
• 1928

• Category
• Broadcast Receiver - or past WW2 Tuner

• Radiomuseum.org ID
• 49945

• Number of Tubes
• 7

• Valves / Tubes
• 26 26 26 26 27 71A unknown_Tube

• Main principle
• TRF (Tuned-Radio-Frequency but use of regeneration unknown)

• Tuned circuits
• 3 AM circuit(s)

• Wave bands
• Broadcast only (MW).

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

• Loudspeaker
• - This model requires external speaker(s).

• Material
• Wooden case

• from Radiomuseum.org
• Model: Armada 78 [AC mains] - Ozarka Inc.; Chicago

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

• Notes
• There is also a battery model 78.
  Rider's Vol. 2-2 shows the correct 78-AC chassic layout but the 78-battery schematic.
  Power supply (rectifier) unknown. See also this instruction as multi page PDF. (size about 3.5 MB).

• External source of data
• Ernst Erb

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

• Mentioned in
• Collector's Guide to Antique Radios (7th Edition)

• Literature/Schematics (1)
• Radio Set Socket Layout 1921 to 1935, RCA (Page 54)

• Other Models

• Here you find 92 models, 61 with images and 20 with schematics for wireless sets etc. In French: TSF for Télégraphie sans fil.
  All listed radios etc. from Ozarka Inc.; Chicago