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HRO-5-1; National Company; (ID = 156914) Commercial Re
HRO-5-1; National Company; (ID = 156916) Commercial Re
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HRO-5-1; National Company; (ID = 156914) Commercial Re
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Country:  United States of America (USA)
Manufacturer / Brand:  National Company; Cambridge & Malden (MA)
alternative name
National Toy Co.
Year: 1946 Category: Commercial Receiver (may include amateur bands)
Valves / Tubes 11: 6K7 6K7 6J7 6J7 6K7 6K7 6SQ7 6V6 6J7 6J5 6H6
Main principle Superhet with RF-stage; ZF/IF 456 kHz; 2 AF stage(s)
Tuned circuits 11 AM circuit(s)
Wave bands Broadcast, Long Wave and more than two Short Wave bands.
Power type and voltage Powered by external power supply or a main unit. / AC 6.3 & DC 240 Volt
Loudspeaker - This model requires external speaker(s).
Power out 1.5 W (unknown quality)
from Model: HRO-5-1 - National Company; Cambridge &
Material Metal case
Shape Boatanchor (heavy military or commercial set >20 kg).

Model HRO-5 with integrated noise limiter referenced in Rider's as HRO-5-1;
most often found as model HRO-5A1 model.

Apparently never shipped as pure HRO-5-1 version.

Coverage: 50 kHz - 30 MHz (9 ganged 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, no bandspread in these coils available).

Modes AM / CW/SSB (BFO).

The 0 – 500 epicyclic readout dial allows for continuous analog tuning while digitally indicating incremental progress over a range of ten full turns of the large tuning knob that tunes with velvet smoothness. Ten times the circumference of the dial is nearly 4 meters on a normal dial scale, which delivers great frequency resolution. The dial is not calibrated to directly indicate a frequency but a frequency calibration chart is necessary to determine the correct operation frequency.

External "dog house" type power supply : PSU 697 (filaments 6.3 V AC, B+ 240 V DC) used as standard.

Net weight (2.2 lb = 1 kg) 14.5 kg / 31 lb 15 oz (31.938 lb)
Price in first year of sale 274.00 $
External source of data Ernst Erb
Source of data Communications Receivers
Circuit diagram reference Rider's Perpetual, Volume 17 = 1948 and before
Mentioned in Shortwave Receivers - Past & Present (3rd ed.)

All listed radios etc. from National Company; Cambridge & Malden (MA)
Here you find 430 models, 275 with images and 163 with schematics for wireless sets etc. In French: TSF for Télégraphie sans fil.