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Fixing Roberts r700 radio
Fixing Roberts r700 radio
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Old 15th March 2011, 09:43 PM   #1
valvesrock is offline valvesrock  United Kingdom
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Join Date: Mar 2011
Talking Fixing Roberts r700 radio

Hi all, I am a new member and have just started trying to fix an old Roberts Radio. I wonder if anyone can help me? I am after circuit diagrams/service information of a Roberts radio type r700? If not are there any fm receiver circuits from other manufacturers that might use the af180 and af114 germanium transistors available? Perhaps these circuits could give me a push in the right direction (by the way the FM is dead on this radio!) Thanks.
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Old 16th March 2011, 01:22 AM   #2
burbeck is offline burbeck  United Kingdom
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Join Date: Aug 2004
Location: Ratae Coritanorum
hi valvesrock
someone on this site may help you UK Vintage Radio Repair and Restoration

these radios were great worth the effort.
transistors types AF114/5/6/7 with the 4 connections have a bad habit of going short between collector case and screen, if this happens snip the screen connection usually works.
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Old 17th March 2011, 12:32 AM   #3
indianajo is offline indianajo  United States
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Location: Jeffersonville, Indiana USA
Any electronic device between 20 and 40 years old needs all the electrolytic capacitors replaced. These look like oil tanks for model trains, covered with cardboard or plastic cover with a plus on one end or a minus on the other. If your unit doesn't have tubes (valves in UK) then it shouldn't have any upright aluminum can electrolytic caps with 2-4 sections. These would need replacing,too. I recapped a 1980 radio I inherited from my father, and it works pretty well. It has better sensitivity than the pocket Sony FM radio I bought 3 years ago. I didn't have a schematic.
Dynakit ST70, ST120, PAS2,Hammond H182(2 ea),H112,A100,10-82TC,Peavey CS800S,1.3K, SP2-XT's, T-300 HF Proj's, Steinway console, Herald RA88a mixer, Wurlitzer 4500, 4300
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Old 20th March 2011, 09:37 PM   #4
gpapag is offline gpapag  Greece
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Fixing Roberts r700 radio
Hi valvesrock
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Last edited by gpapag; 20th March 2011 at 09:40 PM.
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