• Country
• Great Britain (UK)

• Manufacturer / Brand
• International Marine Radio Co. Ltd.; London

• Year
• 1949 ?

• Category
• Commercial Receiver (may include amateur bands)

• Radiomuseum.org ID
• 348459

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

• Number of Tubes
• 12

• Valves / Tubes
• EF37 EF39 CCH35 EF37 EF39 EF37 EF39 EBC33 EF37 CL33 CY31 G120/1B

• Main principle
• Superhet, double/triple conversion; ZF/IF 580 kHz; 2 AF stage(s); something special ? Please give information (notes)

• Wave bands
• Wave Bands given in the notes.

• Power type and voltage
• AC/DC-set / 110 Volt

• Loudspeaker
• -Loudspeaker incorporated, but system not known.

• Material
• Metal case

• from Radiomuseum.org
• Model: Marine Receiver IMR42 - International Marine Radio Co.

• Shape
• Boatanchor (heavy military or commercial set >20 kg).

• Dimensions (WHD)
• 711 x 400 x 394 mm / 28 x 15.7 x 15.5 inch

• Notes

• The IMR42 Receiver covers the complete frequency spectrum between 15 kilocycles and 25 megacycles apart from a narrow band above and below the intermediate frequency of 580 kilocycles.

  To avoid the use of conversion units it has been designed to operate directly from 110 volts direct or alternating current. When the mains supply is 220 volts an external series dropping unit is provided.

  A total of 11 valves, plus rectifier, are employed in what may be described as a "double" circuit arrangement.
  From 150 kilocycles to 25 megacycles the circuit follows the lines of an orthodox superheterodyne, but from 15 to 150 kilocycles it operates as a tuned-radio-frequency receiver. In each combination the first tube functions as an untuned buffer stage designed to reduce radiation in accordance with United Kingdom requirements.

• Net weight (2.2 lb = 1 kg)
• 41 kg / 90 lb 4.9 oz (90.308 lb)

• Source of data
• -- Original-techn. papers.

• Mentioned in
• - - Manufacturers Literature

• Author
• Model page created by Erwin Serle. See "Data change" for further contributors.

• Other Models

• Here you find 7 models, 5 with images and 1 with schematics for wireless sets etc. In French: TSF for Télégraphie sans fil.
  All listed radios etc. from International Marine Radio Co. Ltd.; London