2 Valve Short Wave Receiver

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• Number of Tubes
• 2

• Valves / Tubes

• Main principle
• TRF with regeneration; 1 AF stage(s)

• Wave bands
• Short Wave (SW only)

• Power type and voltage
• Dry Batteries / 6;80;120 Volt

• Loudspeaker
• - only for Earphone!

• Material
• Metal case

• from Radiomuseum.org
• Model: 2 Valve Short Wave Receiver - Marconi's Wireless Telegraph

• Shape
• Tablemodel, Box - most often with Lid (NOT slant panel).

• Dimensions (WHD)
• 430 x 255 x 210 mm / 16.9 x 10 x 8.3 inch

• Notes
• This receiver matches the picture on page 56 of the January 13th, 1926 issue of "Wireless World". The picture heading states 'Short-wave receiver of the type used by Senatore Marconi in the short-wave experiments with the Poldhu station. Interchangeable coils produce a tuning range of 15 to 100 metres'. The "Marconi Review" No. 2 of November 1928 also refers to this receiver in the article: "A Chapter In The History Of The Marconi Beam II". Page 1 describes this receiver as follows: 'There were two receivers, designed by Mr. Mathieu, in use on the "Elettra." The first of these, a copper-screened two-valve instrument, having a waverange of 40 to 100 metres, was used for signal intensity tests, and employed, as shown in the circuit diagram, Fig. 5, an aperiodic aerial, a detector valve with reaction, a tuned grid circuit with vernier condenser, a low pass filter to isolate the telephone circuit from reaction effects, a low-frequency transformer and an audibility test circuit to which the telephone was connected. The test circuit consisted of an artificial line graduated in standard miles and providing a range of adjustment equivalent to 0 to 100 T.U.' Based on the picture, description and schematic, this may be the actual receiver used by Marconi during the short-wave tests conducted aboard his yacht, "Elettra". The serial number "1" stamped into the case also suggests that this was the initial prototype.

• Net weight (2.2 lb = 1 kg)
• 16.4 lb (16 lb 6.4 oz) / 7.446 kg

• Mentioned in
• Wireless World (The), London (WW, 79) (January 13th, 1926, page 56)

• Literature/Schematics (1)
• - - Manufacturers Literature (The Marconi Review, No. 2, November 1928, page 1)

• Author
• Model page created by Gary Berg. See "Data change" for further contributors.

• Other Models
• Here you find 94 models, 92 with images and 17 with schematics for wireless sets etc. In French: TSF for Télégraphie sans fil.
  All listed radios etc. from Marconi's Wireless Telegraph Co. Ltd.

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The model 2 Valve Short Wave Receiver is part of the collections of the following members.