HRO-5A

National Company; Cambridge & Malden (MA)

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  • Year
  • 1945/1946 ?
  • Category
  • Commercial Receiver (may include amateur bands)
  • Radiomuseum.org ID
  • 86518
    • 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 240 Volt
  • Loudspeaker
  • - This model requires external speaker(s).
  • Power out
  • 1.5 W (unknown quality)
  • Material
  • Metal case
  • from Radiomuseum.org
  • Model: HRO-5A - 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

  • Civilian Version of model HRO-5 (HRO Variant 5), with coils with bandspread for amateur radio bands delivered (in contrast to original HRO-5 with comes without bandspread coils).

    Coverage 50 kHz - 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, shortwave coils delivered with bandspread in HAM bands).

    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 to directly indicate a frequency but a frequency calibration chart is necessary to determine the correct operation frequency.

    HRO model Var. 5 , knobs with metal skirts (selectivity control in right upper corner also with metal skirt), black laquered micrometer dial and round S-meter.

    External "dog house" type power supply : PSU 697 (filaments 6.3 V AC, B+ 240 V DC) used as standard.

  • Net weight (2.2 lb = 1 kg)
  • 14.5 kg / 31 lb 15 oz (31.938 lb)
  • Author
  • Model page created by Martin Bösch. See "Data change" for further contributors.

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