HRO Senior HRO-SR

National Company; Cambridge & Malden (MA)

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  • Year
  • 1936 ?
  • Category
  • Commercial Receiver (may include amateur bands)
  • Radiomuseum.org ID
  • 86508
    • alternative name: National Toy Co.
    • Brand: Thrillbox

 Technical Specifications

  • Number of Tubes
  • 9
  • Main principle
  • Superhet with RF-stage; ZF/IF 456 kHz; 2 AF stage(s)
  • Tuned circuits
  • 11 AM circuit(s)
  • Wave bands
  • Broadcast, Long Wave and more than two Short Wave bands.
  • Power type and voltage
  • Powered by external power supply or a main unit. / AC 6.3 & DC 180-240 Volt
  • Loudspeaker
  • - This model requires external speaker(s).
  • Power out
  • 1.5 W (unknown quality)
  • Material
  • Metal case
  • from Radiomuseum.org
  • Model: HRO Senior HRO-SR - 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

  • After introduction of the HRO Junior the original fully featured HRO ( with crystal filter, S-meter, 4 coil sets and bandspread ) was referenced retroactively as HRO Senior.

    This is not a special model, only the testimony of an additional suffix given in order to distinguish it from the HRO Junior.

    See different HRO model variants  ( Var. 1 - Var. 6 )

    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 immediately available at extra cost, 7 more coil sets sold later including long waves ( total spectrum covered from 50 kHz to 54 MHz ).

    Modes 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 dial scale, which delivers great frequency resolution. The dial is not calibrated, so more used as logging dial, the frequency is determined used printed calibration charts on coil sets.

    External "dog house" power supplies used : 5886 (B+ 180V), PSU 697 (B+ 240V) or 5897 (filaments 2,5V AC, B+ 230V DC) for sets equipped with battery valves set.

  • Net weight (2.2 lb = 1 kg)
  • 14.5 kg / 31 lb 15 oz (31.938 lb)
  • Price in first year of sale
  • 233.00 USD
  • Author
  • Model page created by Martin Bösch. See "Data change" for further contributors.

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The model HRO Senior is part of the collections of the following members.

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