Please click your language flag. Bitte Sprachflagge klicken.


HRO-500P; National Company; (ID = 2050147) Amateur-R
Use red slider bar for more.
HRO-500P; National Company; (ID = 2050147) Amateur-R
National Company;: HRO-500P [Amateur-R] ID = 2050147 1400x901
Select picture or schematic to display from thumbnails on the right and click for download.
For model HRO-500P, National Company; Cambridge & Malden (MA):
National Company sales brochure.
Country:  United States of America (USA)
Manufacturer / Brand:  National Company; Cambridge & Malden (MA)
alternative name
National Toy Co.
Year: 1964–1973 Category: Amateur-Receiver (amateur bands, may include broadcast bands)
Semiconductors (the count is only for transistors) 37:
Main principle Superhet, double/triple conversion; ZF/IF 2750/230 kHz
Wave bands Broadcast, Long Wave and more than two Short Wave bands.
Power type and voltage Storage Battery for all (e.g. for car radios and amateur radios)
Loudspeaker Permanent Magnet Dynamic (PDyn) Loudspeaker (moving coil)
Power out
from Model: HRO-500P - National Company; Cambridge &
Material Metal case
Shape Portable set > 8 inch (also usable without mains)
Notes coverage 5 - 30000 kHz, triple conversion up to 4 MHz, double conversion above 4 MHz;
linear analog readout, Wadley-loop, preselector, passband tuning, notch filter;
portable version with built-in speaker, BP-8 NiCad-battery and WPC-5 carry case.
Source of data 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.