- Country
- United States of America (USA)
- Manufacturer / Brand
- National Company; Cambridge & Malden (MA)
- Year
- 1947–1949
- Category
- Amateur-Receiver (amateur bands, may include broadcast bands)
- Radiomuseum.org ID
- 87460
-
- alternative name: National Toy Co.
- Brand: Thrillbox
Click on the schematic thumbnail to request the schematic as a free document.
- Number of Tubes
- 11
- Main principle
- Superhet with RF-stage; ZF/IF 456 kHz
- Wave bands
- Broadcast, Long Wave and more than two Short Wave bands.
- Power type and voltage
- Alternating Current supply (AC) / 115 / 230 Volt
- Loudspeaker
- - For headphones or amp.
- Power out
- 1.5 W (unknown quality)
- Material
- Metal case
- from Radiomuseum.org
- Model: HRO-7-R - National Company; Cambridge &
- Shape
- Rack
- 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);
rack version of HRO-7, integrated noise limiter, grey micrometer dial and coil sets with linear marks;
external power supply SPU-697 (voltages: filaments 6,3V B+ 240V), optional rack speaker RFSH.
- Source of data
- Communications Receivers
- Mentioned in
- Photofact Folder, Howard W. SAMS (4820-12 Set 50 Folder 12)
- Author
- Model page created by Martin Bösch. See "Data change" for further contributors.
- Other Models
-
Here you find 446 models, 285 with images and 189 with schematics for wireless sets etc. In French: TSF for Télégraphie sans fil.
All listed radios etc. from National Company; Cambridge & Malden (MA)