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R77

R77; Roberts Radio Co.Ltd (ID = 2317353) Radio
 
R77; Roberts Radio Co.Ltd (ID = 2317354) Radio
 
R77; Roberts Radio Co.Ltd (ID = 67412) Radio
 
R77; Roberts Radio Co.Ltd (ID = 67413) Radio
 
R77; Roberts Radio Co.Ltd (ID = 563711) Radio
 
R77; Roberts Radio Co.Ltd (ID = 563712) Radio
 
R77; Roberts Radio Co.Ltd (ID = 2000623) Radio
R77; Roberts Radio Co.Ltd (ID = 1640602) Radio R77; Roberts Radio Co.Ltd (ID = 51979) Radio
R77; Roberts Radio Co.Ltd (ID = 419092) Radio R77; Roberts Radio Co.Ltd (ID = 51980) Radio
R77; Roberts Radio Co.Ltd (ID = 302130) Radio R77; Roberts Radio Co.Ltd (ID = 681528) Radio
R77; Roberts Radio Co.Ltd (ID = 681529) Radio R77; Roberts Radio Co.Ltd (ID = 1243068) Radio
R77; Roberts Radio Co.Ltd (ID = 1640605) Radio R77; Roberts Radio Co.Ltd (ID = 1640606) Radio
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R77; Roberts Radio Co.Ltd (ID = 1640602) Radio
Roberts Radio Co.Ltd: R77 [Radio] ID = 1640602 933x871
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For model R77, Roberts Radio Co.Ltd., East Molesey, Surrey, UK:
Leather condition extremely poor. Both zips had to be glued and stitched.
 
Country:  Great Britain (UK)
Manufacturer / Brand:  Roberts Radio Co.Ltd., East Molesey, Surrey, UK
Year: 1957 Category: Broadcast Receiver - or past WW2 Tuner
Valves / Tubes 4: DK96 DF96 DAF96 DL96
Main principle Superheterodyne (common); 2 AF stage(s)
Tuned circuits 6 AM circuit(s)
Wave bands Broadcast (MW) and Long Wave.
Details
Power type and voltage Dry Batteries / 1.5 & 90 Volt
Loudspeaker Permanent Magnet Dynamic (PDyn) Loudspeaker (moving coil) / Ø 4 inch = 10.2 cm
Power out
from Radiomuseum.org Model: R77 - Roberts Radio Co.Ltd., East
Material Leather / canvas / plastic - over other material
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
Mentioned in Radio! Radio!
Literature/Schematics (1) Trader Service Sheet (suppl. of Wireless & El. Trader, etc.) (1352 [17th May 1958])
Literature/Schematics (2) Radio And Television Servicing books (R&TVS) (Vol VI, p220, 6 vol 1957-58 Edition.)
Literature/Schematics (3) Radio Bygones Oct/Nov 1996 Issue No.43
Literature/Schematics (4) Wireless World (The), London (WW, 79) (Vol. 63, Sept. 1957, p. 420-421)

Model page created by Volker Jeschkeit. See "Data change" for further contributors.



All listed radios etc. from Roberts Radio Co.Ltd., East Molesey, Surrey, UK
Here you find 82 models, 78 with images and 43 with schematics for wireless sets etc. In French: TSF for Télégraphie sans fil.




  
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