SW-3 Model I var 1b
National Company; Cambridge & Malden (MA)
- Country
- United States of America (USA)
- Manufacturer / Brand
- National Company; Cambridge & Malden (MA)
- Year
- 1931 ?
- Category
- Broadcast Receiver - or past WW2 Tuner
- Radiomuseum.org ID
- 49614
-
- alternative name: National Toy Co.
- Brand: Thrillbox
- Number of Tubes
- 3
- Main principle
- TRF with regeneration; 1 AF stage(s)
- Wave bands
- Broadcast, Long Wave and Short Wave.
- Power type and voltage
- Powered by external power supply or a main unit. / 2,5 / 135-180 Volt
- Loudspeaker
- - For headphones or amp.
- Material
- Metal case
- from Radiomuseum.org
- Model: SW-3 Model I [var 1b] - National Company; Cambridge &
- Shape
- Tablemodel, with any shape - general.
- Notes
- plug-in coils series "10-22" for coverage 90 - 35000 kHz;
headphones operation only, no audio output stage
the first SW-3 radios came in the cabinet but have been wired externally ("Jackson Laboratories", a National affiliated enterprise), due to licensing reasons . Amateur bandspread coils standard equipment. Matching power supply is 5880.
- Price in first year of sale
- 55.00 $
- External source of data
- Ernst Erb
- Source of data
- Radio Collector`s Guide 1921-1932
- Mentioned in
- QST Dec.1931, p.2
- Other Models
-
Here you find 445 models, 284 with images and 189 with schematics for wireless sets etc. In French: TSF for Télégraphie sans fil.
All listed radios etc. from National Company; Cambridge & Malden (MA)