• Country
• Great Britain (UK)

• Manufacturer / Brand
• HMV (Brand), His Masters Voice, The Gramophone Company Ltd.; Middlesex

• Year
• 1959 ?

• Category
• Car Radio, perhaps also + sound player/recorder

• Radiomuseum.org ID
• 135952

• Number of Tubes
• 2

• Valves / Tubes
• X78 W77

• Main principle
• Superheterodyne (common)

• Wave bands
• Broadcast (MW) and Long Wave.

• Power type and voltage
• Powered by external power supply or a main unit.

• Loudspeaker
• - For headphones or amp.

• Material
• Metal case

• from Radiomuseum.org
• Model: Radiomobile 4220 [Control Unit] - HMV Brand, His Masters Voice,

• Shape
• Chassis only or for «building in»

• Dimensions (WHD)
• 4.25 x 5.25 x 7 inch / 108 x 133 x 178 mm

• Notes
• Radio control unit, made by S Smith & Sons (Radiomobile) Ltd. 4 MW push buttons & 1 LW button (preselectors). Requires seperate unit comprising of IF, Audio, & PSU stages. See here and here.

• Author
• Model page created by Keith Staines. See "Data change" for further contributors.

• Other Models

• Here you find 421 models, 330 with images and 242 with schematics for wireless sets etc. In French: TSF for Télégraphie sans fil.
  All listed radios etc. from HMV (Brand), His Masters Voice, The Gramophone Company Ltd.; Middlesex