HRO-S Prototype

National Company; Cambridge & Malden (MA)

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  • Year
  • 1934 ?
  • Category
  • Commercial Receiver (may include amateur bands)
  • Radiomuseum.org ID
  • 86506
    • alternative name: National Toy Co.
    • Brand: Thrillbox

 Technical Specifications

  • Number of Tubes
  • 10
  • Main principle
  • Superhet with RF-stage; ZF/IF 456 kHz; 2 AF stage(s)
  • Tuned circuits
  • 11 AM circuit(s)
  • Wave bands
  • Broadcast plus more than 2 Short Wave bands.
  • Power type and voltage
  • Alternating Current supply (AC) / 115 Volt
  • Loudspeaker
  • - This model requires external speaker(s).
  • Power out
  • 1.5 W (unknown quality)
  • Material
  • Metal case
  • from Radiomuseum.org
  • Model: HRO-S [Prototype] - National Company; Cambridge &
  • Shape
  • Boatanchor (heavy military or commercial set >20 kg).
  • Dimensions (WHD)
  • 440 x 220 x 300 mm / 17.3 x 8.7 x 11.8 inch
  • Notes

  • HRO model with 2,5 V heated tube set and integrated power supply using tube 80 as rectifier. Prototype. Apparently never sold to the public.

    Coverage :

    1.7 – 30 MHz ( 4 standard ganged coil sets for 1.7 – 4, 3.5 – 7.3, 7 – 14.4, 14 – 30 MHz included, 2 coil sets for broadcast available ).

    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 plain dial scale, which delivers great frequency resolution.

  • Net weight (2.2 lb = 1 kg)
  • 18 kg / 39 lb 10.4 oz (39.648 lb)
  • Author
  • Model page created by Martin Bösch. See "Data change" for further contributors.

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