• Country
• Great Britain (UK)

• Manufacturer / Brand
• RGD (Brand), Radio Gramophone Development Co. Ltd.; Birmingham

• Year
• 1958 ?

• Category
• Broadcast Receiver - or past WW2 Tuner

• Radiomuseum.org ID
• 99269

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

• Number of Tubes
• 4

• Valves / Tubes
• DK96 DF96 DAF96 DL96

• Number of Transistors

• Semiconductors
• Metal-rectifier

• Main principle
• Superheterodyne (common); ZF/IF 470 kHz; 2 AF stage(s)

• Tuned circuits
• 6 AM circuit(s)

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

• Power type and voltage
• Line / Batteries (any type) / 110-120; 190-250 / 1.4 & 90 Volt

• Loudspeaker
• Permanent Magnet Dynamic (PDyn) Loudspeaker (moving coil)

• Material
• Leather / canvas / plastic - over other material

• from Radiomuseum.org
• Model: B55 - RGD Brand, Radio Gramophone

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

• Dimensions (WHD)
• 280 x 185 x 105 mm / 11 x 7.3 x 4.1 inch

• Notes

• Battery is combined "balanced" Ever Ready B147, same four pin connector as B141, which is too large.

  Unusually the filaments are switched Parallel to Series for AC Mains operation. There is a later similar chassis RGD B55 MkII in a plastic case. The Regentone Double Two is also a similar chassis to the B55 and B55 MkII as Regentone owned by RGD then.

  Rexine style covering on plywood cabinet.

  Economy switch reduces Battery LT consumption by 25mA and somewhat reduces HT consumption. It disconnects one of the DL96 Filaments.

  Wavebands:

  • LW 1150  ... 1875 m
  • MW 187 ... 570 m

  Warning: Chassis may be live when connected to mains. Use batteries or accurate bench LT (1.35V) & HT (80V) supplies for alignment.

  Power line cord plug operates large spring loaded slide switch for mains/battery switching.

  Battery compartment 250 x 40 x 90 mm (W x H x D), catalogue size for B147 is 254 x 38 x 70 mm. There is additional approx. 10 x 30 x 90 mm either side above bottom corner case structure posts.

• Net weight (2.2 lb = 1 kg)
• 2.1 kg / 4 lb 10 oz (4.626 lb)

• Author
• Model page created by Jean-Paul Moriamé. See "Data change" for further contributors.

• Other Models

• Here you find 148 models, 115 with images and 66 with schematics for wireless sets etc. In French: TSF for Télégraphie sans fil.
  All listed radios etc. from RGD (Brand), Radio Gramophone Development Co. Ltd.; Birmingham