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Country:  United States of America (USA)
Manufacturer / Brand:  National Company; Cambridge & Malden (MA)
alternative name
National Toy Co.
Year: 1951/1952 Category: Amateur-Receiver (amateur bands, may include broadcast bands)
Valves / Tubes 15: 6BA6 6BA6 6BE6 6C4 6K7 6SG7 6SG7 6H6 6H6 6SN7 6SJ7 6V6GT 6V6GT 6J7 0B2 5V4G
Main principle Superhet with RF-stage; ZF/IF 455 kHz
Power type and voltage Alternating Current supply (AC) / 110-120 / 220-240 Volt
Loudspeaker - For headphones or amp.
Power out 8 W (unknown quality)
from Model: HRO-50-R1 - National Company; Cambridge &
Material Metal case
Shape Rack
Dimensions (WHD) 483 x 267 x 444 mm / 19 x 10.5 x 17.5 inch
Notes coverage 0,05 - 30 MHz (9 coil sets 50-100 / 100-200 / 180-430 / 480-960 / 900-2050 kHz / 1,7-4 / 3,5-7,3 / 7-14,4 / 14-30 MHz, bandspread in HAM bands), AM/CW/SSB (BFO);
internal power supply, optional rack speaker HRO-50-RS, optional crystal calibrator XCU, optional narrow band-FM adaptor NFM-50, optional 650S 6V-vibrator pack and SOJ-3 select-o-ject.
Source of data Communications Receivers
Circuit diagram reference Rider's Perpetual, Volume 22, covering 1951
Mentioned in Shortwave Receivers - Past & Present (3rd ed.)

Model page created by Martin Bösch. See "Data change" for further contributors.

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.