NC-57M

National Company; Cambridge & Malden (MA)

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  • Year
  • 1950/1951 ?
  • Category
  • Commercial Receiver (may include amateur bands)
  • Radiomuseum.org ID
  • 87741
    • 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
  • 8
  • 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
  • AC/DC-set / 110-130 Volt
  • Loudspeaker
  • Permanent Magnet Dynamic (PDyn) Loudspeaker (moving coil) / Ø 5 inch = 12.7 cm
  • Power out
  • 1.5 W (unknown quality)
  • Material
  • Metal case
  • from Radiomuseum.org
  • Model: NC-57M - National Company; Cambridge &
  • Shape
  • Tablemodel, with any shape - general.
  • Dimensions (WHD)
  • 419 x 298 x 222 mm / 16.5 x 11.7 x 8.7 inch
  • Notes

  • coverage 190-410 and 560 - 35000 kHz, AM, CW (BFO);
    AC/DC marine version of the NC-57

    Note hazard: Like many other Marine AC-DC receivers primarily intended for operation on 120 VDC shipboard, the chassis is directly connected to one side of the power line.  The cabinet is insulated from the chassis.  That insulation must be maintained.  The pilot lamp is at full line voltage.  The power switch connects the chassis to one side of the power line.  Thus the chassis can be live with voltage either by switching on or if off, by way of the cold tube filaments.

    An isolation transformer must be used for servicing.  For safety it is suggested for operation on AC also.

  • Net weight (2.2 lb = 1 kg)
  • 14 kg / 30 lb 13.4 oz (30.837 lb)
  • Price in first year of sale
  • 99.00 $
  • Author
  • Model page created by Martin Bösch. See "Data change" for further contributors.

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