R77

Roberts Radio Co.Ltd., East Molesey, Surrey, UK

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  • Year
  • 1957
  • Category
  • Broadcast Receiver - or past WW2 Tuner
  • Radiomuseum.org ID
  • 69047

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

 Technical Specifications

  • Number of Tubes
  • 4
  • Main principle
  • Superheterodyne (common); 2 AF stage(s)
  • Tuned circuits
  • 6 AM circuit(s)
  • Wave bands
  • Broadcast (MW) and Long Wave.
  • Power type and voltage
  • Dry Batteries / 1.5 & 90 Volt
  • Loudspeaker
  • Permanent Magnet Dynamic (PDyn) Loudspeaker (moving coil) / Ø 4 inch = 10.2 cm
  • Material
  • Leather / canvas / plastic - over other material
  • from Radiomuseum.org
  • Model: R77 - Roberts Radio Co.Ltd., East
  • Shape
  • Portable set > 8 inch (also usable without mains)
  • Dimensions (WHD)
  • 9 x 6 x 3.5 inch / 229 x 152 x 89 mm
  • Notes

  • Real leather Binocular style case with shoulder strap. Under the main body leather the case is heavy card with a steel border riveted on topedge which the chassis is mounted on. Bottom unzips to replace the battery packs. Radio may be listened to with top zipped closed.

    Batteries: HT B126 and LT AD35. Perhaps 75 to 100 hours battery life (later AD35 in late 1960s may have been shorter life).

    Repackaged in 1958 as Roberts R88, probably the last Roberts Valve Portable. Possibly the R77 is the penultimate portable from Roberts before the transistor Roberts RT1. Possibly first Roberts portable to use a PCB (Pye was a couple of years earlier).

    The speaker grill is very much smaller than the loudspeaker unit!

  • Net weight (2.2 lb = 1 kg)
  • 4.5 lb (4 lb 8 oz) / 2.043 kg
  • Literature/Schematics (3)
  • Radio Bygones Oct/Nov 1996 Issue No.43

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