SW-3 Model I (2VDC SW-3) var 2

National Company; Cambridge & Malden (MA)

  • Year
  • 1932 ?
  • Category
  • Broadcast Receiver - or past WW2 Tuner
  • Radiomuseum.org ID
  • 49539
    • alternative name: National Toy Co.
    • Brand: Thrillbox

 Technical Specifications

  • Number of Tubes
  • 3
  • Main principle
  • TRF with regeneration
  • Wave bands
  • Broadcast, Long Wave and Short Wave.
  • Power type and voltage
  • Dry Batteries / 1,4 / 3/67/135 Volt
  • Loudspeaker
  • - For headphones or amp.
  • Material
  • Metal case
  • from Radiomuseum.org
  • Model: SW-3 Model I [var 2] - National Company; Cambridge &
  • Shape
  • Tablemodel, with any shape - general.
  • Dimensions (WHD)
  • 250 x 200 x 280 mm / 9.8 x 7.9 x 11 inch
  • Notes
  • The National SW-3 Model I (2VDC SW-3) uses plug-in coils series "10-22" for coverage 90 - 35000 kHz. Headphones operation only, no audio output stage. The National 2V DC SW-3 is the Direct Current version of the National SW-3. It uses different tubes, but basically the same circuit as the 6V DCSW-3 (6 volt DC version) or the ACSW-3 (the 110VAC version).
  • Net weight (2.2 lb = 1 kg)
  • 5.4 kg / 11 lb 14.3 oz (11.894 lb)
  • External source of data
  • Ernst Erb
  • Circuit diagram reference
  • Rider's Perpetual, Volume 14 = 1944 = before 1943

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