• Country
• Great Britain (UK)

• Manufacturer / Brand
• Unknown - CUSTOM BUILT: GB

• Year
• 1956/1957 ?

• Category
• Commercial Transmitter & Receiver (TRX not Amateur)

• Radiomuseum.org ID
• 93698

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

• Number of Tubes
• 9

• Valves / Tubes
• EF72 EA76 QS1202 5A/163K 5B/251M

• Number of Transistors
• 1

• Semiconductors

• Main principle
• Superheterodyne (common); ZF/IF 465 kHz

• Wave bands
• Wave Bands given in the notes.

• Power type and voltage
• Other, details in remarks or not known. / 100-150, 200-250, 12 Volt

• Loudspeaker
• - For headphones or amp.

• Material
• Metal case

• from Radiomuseum.org
• Model: Mark 123 - Unknown - CUSTOM BUILT: GB

• Shape
• Portable set > 8 inch (also usable without mains)

• Dimensions (WHD)
• 299 x 85 x 136 mm / 11.8 x 3.3 x 5.4 inch

• Notes
• Spy or Diplomatic Transceiver with 2.5 to 20 MHz in three ranges for CW only. Works with Mains AC oder 12V DC or Mk.801A hand crank generator. Case or wooden box known. Some tubes are more than one times.

• Net weight (2.2 lb = 1 kg)
• 3.5 kg / 7 lb 11.3 oz (7.709 lb)

• Source of data
• -- Collector info (Sammler)

• Author
• Model page created by a member from A. See "Data change" for further contributors.

• Other Models

• Here you find 116 models, 106 with images and 10 with schematics for wireless sets etc. In French: TSF for Télégraphie sans fil.
  All listed radios etc. from Unknown - CUSTOM BUILT: GB