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HRO Var. 2 (according to Moore)

HRO; National Company; (ID = 888437) Commercial Re HRO; National Company; (ID = 888438) Commercial Re
HRO; National Company; (ID = 888439) Commercial Re HRO; National Company; (ID = 888440) Commercial Re
HRO; National Company; (ID = 1011524) Commercial Re HRO; National Company; (ID = 1984963) Commercial Re
HRO; National Company; (ID = 1984964) Commercial Re HRO; National Company; (ID = 1984965) Commercial Re
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HRO; National Company; (ID = 888437) Commercial Re
National Company;: HRO [Commercial Re] ID = 888437 933x571
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For model HRO Var. 2 (according to Moore), National Company; Cambridge & Malden (MA):
Var. 2: push-pull S-Meter switch, dark dial knob
Country:  United States of America (USA)
Manufacturer / Brand:  National Company; Cambridge & Malden (MA)
alternative name
National Toy Co.
Year: 1935/1936 ? Category: Commercial Receiver (may include amateur bands)
Valves / Tubes 9: 6D6 6D6 6C6 6C6 6D6 6D6 6B7 42 6C6
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 Alternating Current supply (AC) / AC 6.3 & DC 180 Volt
Loudspeaker - This model requires external speaker(s).
Power out 1.5 W (unknown quality)
from Model: HRO [Var. 2 ] - National Company; Cambridge &
Material Metal case
Shape Boatanchor (heavy military or commercial set >20 kg).
Dimensions (WHD) 440 x 220 x 300 mm / 17.3 x 8.7 x 11.8 inch

Coverage :

1.7 – 30 MHz ( 4 standard ganged coil sets for 1.7 – 4, 3.5 – 7.3, 7 – 14.4, 14 – 30 MHz included, 2 coil sets for broadcast immediately available at extra cost, 7 more coil sets sold later including long waves ( total spectrum covered from 50 kHz to 54 MHz ).

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.

Knobs with metal skirts, push-pull type S-meter switch, pilot light left of selectivity switch, dark calibration charts with white lettering.

External power supply : PSU 697, 5897 or 5886 ("dog house" type).

Net weight (2.2 lb = 1 kg) 14.5 kg / 31 lb 15 oz (31.938 lb)
Price in first year of sale 233.00 USD
Source of data Communications Receivers
Literature/Schematics (3) Le Guide du Collectionneur TSF Biraud/Foster, Vol. I (page 238)

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.