HFS

National Company; Cambridge & Malden (MA)

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  • Year
  • 1947–1952 ?
  • Category
  • Amateur-Receiver (amateur bands, may include broadcast bands)
  • Radiomuseum.org ID
  • 86400
    • alternative name: National Toy Co.
    • Brand: Thrillbox

Click on the schematic thumbnail to request the schematic as a free document.

 Technical Specifications

  • Number of Tubes
  • 7
  • Main principle
  • Superheterodyne (common); ZF/IF 10700 kHz
  • Wave bands
  • Wave Bands given in the notes.
  • Power type and voltage
  • Powered by external power supply or a main unit. / 6 / 180 Volt
  • Loudspeaker
  • Permanent Magnet Dynamic (PDyn) Loudspeaker (moving coil)
  • Material
  • Metal case
  • from Radiomuseum.org
  • Model: HFS - National Company; Cambridge &
  • Shape
  • Tablemodel, with any shape - general.
  • Dimensions (WHD)
  • 16.5 x 8.75 x 8.5 inch / 419 x 222 x 216 mm
  • Notes

  • National HFS: VHF-receiver covering 27 - 250 MHz (A: 178-250 MHz, B: 120-178 MHz, C: 80-120 MHz, D: 56-80 MHz, E: 41-60 MHz, F: 27-42 MHz with 6 plug-in coil sets); Modes AM, CW, FM;  The circuit is superheterodyne, but the detector is super-regenerative (slope detection).  The set can optionally be used as a converter with output jack at 10.7 MHz for dual conversion with an external receiver. It replaced the older National 1-10 and 1-10A.
    powered by optional external power supply 5886AB or 6 volts vibrator pack 686S.

  • Net weight (2.2 lb = 1 kg)
  • 8.5 kg / 18 lb 11.6 oz (18.722 lb)
  • Price in first year of sale
  • 125.00 $
  • Literature/Schematics (2)
  • The Spectrum Monitor, March 2023, Rich Post article "National's VHF Receiver-Converter, Model HFS"
  • Author
  • Model page created by Martin Bösch. See "Data change" for further contributors.

 Collections | Museums | Literature

Collections

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

Museums

The model can be seen in the following museums.

 Forum