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HRO-7

HRO-7; National Company; (ID = 741405) Amateur-R
 
HRO-7; National Company; (ID = 1163961) Amateur-R
HRO-7; National Company; (ID = 541255) Amateur-R HRO-7; National Company; (ID = 1163960) Amateur-R
HRO-7; National Company; (ID = 1384329) Amateur-R HRO-7; National Company; (ID = 2049567) Amateur-R
HRO-7; National Company; (ID = 2049583) Amateur-R
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HRO-7; National Company; (ID = 541255) Amateur-R
National Company;: HRO-7 [Amateur-R] ID = 541255 640x238
Select picture or schematic to display from thumbnails on the right and click for download.
For model HRO-7, National Company; Cambridge & Malden (MA):
By courtesy of 'antiqueradios.com'!
 
Country:  United States of America (USA)
Manufacturer / Brand:  National Company; Cambridge & Malden (MA)
alternative name
 
National Toy Co.
Brand
Thrillbox
Year: 1947–1949 Category: Amateur-Receiver (amateur bands, may include broadcast bands)
Valves / Tubes 11: 6K7 6K7 6J7 6C4 6K7 6K7 6H6 6H6 6SJ7 6V6GT 6J7 0A2
Main principle Superhet with RF-stage; ZF/IF 456 kHz
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. / 115 / 230 Volt
Loudspeaker - This model requires external speaker(s).
Power out
from Radiomuseum.org Model: HRO-7 - National Company; Cambridge &
Material Metal case
Shape Boatanchor (heavy military or commercial set >20 kg).
Dimensions (WHD) 19.5 x 10 x 10 inch / 495 x 254 x 254 mm
Notes

coverage 0,05 - 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, bandspread in HAM bands), AM/CW/SSB (BFO);
new streamlined cabinet, integrated noise limiter, grey micrometer dial and coil sets with linear marks;
external power supply 697 (voltages: filaments 6,3V B+ 240V), optional external speaker MCR or HRO-7TS.

The black wrinkle finished version of the HRO 7 is more rare than the smooth gray. It has matching coils, MCR speaker and 697 power supply.

Net weight (2.2 lb = 1 kg) 29.5 kg / 64 lb 15.6 oz (64.978 lb)
Price in first year of sale 279.00 $
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.)
Literature/Schematics (1) Allied Catalog 1949 page 11


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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