- Country
- United States of America (USA)
- Manufacturer / Brand
- National Company; Cambridge & Malden (MA)
- Year
- 1951/1952
- Category
- Amateur-Receiver (amateur bands, may include broadcast bands)
- Radiomuseum.org ID
- 49567
-
- alternative name: National Toy Co.
- Brand: Thrillbox
Click on the schematic thumbnail to request the schematic as a free document.
- Number of Tubes
- 15
- Main principle
- Superhet with RF-stage; ZF/IF 455 kHz
- Wave bands
- Broadcast, Long Wave and more than two Short Wave bands.
- Power type and voltage
- (110-120; 220-240 V ?)
- Loudspeaker
- (- This model requires external speaker(s). ?)
- Power out
- 8 W (unknown quality)
- Material
- Metal case
- from Radiomuseum.org
- Model: HRO-50-1 - National Company; Cambridge &
- Shape
- Boatanchor (heavy military or commercial set >20 kg).
- Dimensions (WHD)
- 501 x 257 x 420 mm / 19.7 x 10.1 x 16.5 inch
- Notes
-
(
The National HRO-50 family are AC operated multi-band communications receivers.
Note that the original HRO-50 and the updated HRO-50-1 models are generic and not actual models offered for sale. They are sold as the T table model or the R rack mount model.
Features include:
- Bands: 0.05 - 30 MHz (9 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),
- First HRO model with internal power supply,
- Headphone jack on front panel,
- Optional external speaker HRO-50TS for table models or HRO-50RS for rack models,
- Optional crystal calibrator unit XCU for original T/R models or XCU-50-2 for updated T1/R1 models,
- Optional narrow band-FM adaptor NFM-50,
- Optional 650S 6V-vibrator pack, and
- Select-O-Ject notch filter SOJ-3.
The family models are:
Model Table/Rack Mount Tubes HRO-50T Table 17 HRO-50R Rack Mount 17 HRO-50T1 Table 15 HRO-50R1 Rack Mount 15 See also R460/UR version for US Coast Guard.
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- Net weight (2.2 lb = 1 kg)
-
(94.714 lb (94 lb 11.4 oz) / 43.000 kg ?)
- Price in first year of sale
- (335.00 ?) (USD ?)
- External source of data
- Ernst Erb
- Source of data
-
(will be deleted ?)
- Circuit diagram reference
- Rider's Perpetual, Volume 22, covering 1951
- Mentioned in
- (Communications Receivers ?)
- Literature/Schematics (1)
- (Photofact Folder, Howard W. SAMS ?) (Set 169, Folder 11, June 1952. ?)
- Literature/Schematics (2)
- (Shortwave Receivers - Past & Present (4th ed.) ?) (page 485. ?)
- Other Models
-
Here you find 445 models, 283 with images and 184 with schematics for wireless sets etc. In French: TSF for Télégraphie sans fil.
All listed radios etc. from National Company; Cambridge & Malden (MA)