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SW-3 Model I var 1a

SW-3 Model I; National Company; (ID = 715533) Radio SW-3 Model I; National Company; (ID = 715535) Radio
SW-3 Model I; National Company; (ID = 715536) Radio SW-3 Model I; National Company; (ID = 715537) Radio
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SW-3 Model I; National Company; (ID = 715533) Radio
National Company;: SW-3 Model I [Radio] ID = 715533 764x600
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For model SW-3 Model I var 1a, National Company; Cambridge & Malden (MA):
The National SW-3 from the front. Photo courtesy of Charles O'Malley's Dinnerware & Collectibles on eBay.
Country:  United States of America (USA)
Manufacturer / Brand:  National Company; Cambridge & Malden (MA)
alternative name
National Toy Co.
Year: 1931 ? Category: Broadcast Receiver - or past WW2 Tuner
Valves / Tubes 3: 24 24 27
Main principle TRF with regeneration
Wave bands Broadcast and Short Wave (SW).
Power type and voltage Alternating Current supply (AC) / 2,5 / 135-180 Volt
Loudspeaker - For headphones or amp.
Power out
from Model: SW-3 Model I [var 1a] - National Company; Cambridge &
Material Metal case
Shape Tablemodel, with any shape - general.
Notes plug-in coils with color code or numbers series "10-22";
headphones operation only, no audio output stage
possibly identical to Thrill Box SW-3
Price in first year of sale 55.00 $
External source of data Ernst Erb
Source of data Radio Collector`s Guide 1921-1932

All listed radios etc. from National Company; Cambridge & Malden (MA)
Here you find 430 models, 275 with images and 162 with schematics for wireless sets etc. In French: TSF for Télégraphie sans fil.