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HRO-MX

HRO-MX ; National Company; (ID = 676338) Receiver-C
 
HRO-MX ; National Company; (ID = 676387) Receiver-C
HRO-MX ; National Company; (ID = 1080465) Receiver-C HRO-MX ; National Company; (ID = 1080472) Receiver-C
HRO-MX ; National Company; (ID = 1080471) Receiver-C HRO-MX ; National Company; (ID = 1081155) Receiver-C
HRO-MX ; National Company; (ID = 1081156) Receiver-C HRO-MX ; National Company; (ID = 1081157) Receiver-C
HRO-MX ; National Company; (ID = 1081158) Receiver-C HRO-MX ; National Company; (ID = 1080466) Receiver-C
HRO-MX ; National Company; (ID = 2158031) Receiver-C HRO-MX ; National Company; (ID = 2158033) Receiver-C
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HRO-MX ; National Company; (ID = 1080465) Receiver-C
National Company;: HRO-MX [Receiver-C] ID = 1080465 933x489
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For model HRO-MX, National Company; Cambridge & Malden (MA):
By courtesy of Marc McIntyre, Belfast, Northern Ireland, UK.
 
Country:  United States of America (USA)
Manufacturer / Brand:  National Company; Cambridge & Malden (MA)
alternative name
 
National Toy Co.
Brand
Thrillbox
Year: 1944/1945 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.
Details
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 Radiomuseum.org Model: HRO-MX - National Company; Cambridge &
Material Metal case
Shape Boatanchor (heavy military or commercial set).
Dimensions (WHD) 435 x 225 x 295 mm / 17.1 x 8.9 x 11.6 inch
Notes

HRO-M model Var. 5, with crystal integrated in crystal unit housing.

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.

HRO model Var. 5 with all wave coil sets without bandspread (only one printed calibration chart on coil sets), knobs with metal skirts (selectivity control in right upper corner also with metal skirt), black laquered micrometer dial and round S-meter.

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)
Collectors' prices  
External source of data Ernst Erb
Source of data Communications Receivers
Circuit diagram reference Rider's Perpetual, Volume 17 = 1948 and before


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.





  
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