UK Vintage Radio Repair and Restoration Discussion Forum - View Single Post

ferryman · 16th Jan 2020, 5:16 pm

I have a Roberts R707 which was purchased in1973 but has only been used occasionally for many years. The radio is in good general condition and used to sound nice. Until recently it has always worked but now it is not working.

When it is switched on there is a hum from the speakers and I have noticed that a lead from TR7 is overheating. TR7 is shown on the circuit diagram as an AC188.

I suspected the capacitors and have replaced C35,C39,C41,C42 but the fault remains and I am wondering whether TR6 and TR7 need to be replaced?

I have no real knowledge of radio electronics and am very much an amateur. I am new to this Forum and have joined in order to request assistance / advice which would be much appreciated.

Julian

16th Jan 2020, 5:16 pm	#1
ferryman Diode Join Date: Jan 2020 Location: Hertford, Hertfordshire, UK. Posts: 4	Roberts R707 not working I have a Roberts R707 which was purchased in1973 but has only been used occasionally for many years. The radio is in good general condition and used to sound nice. Until recently it has always worked but now it is not working. When it is switched on there is a hum from the speakers and I have noticed that a lead from TR7 is overheating. TR7 is shown on the circuit diagram as an AC188. I suspected the capacitors and have replaced C35,C39,C41,C42 but the fault remains and I am wondering whether TR6 and TR7 need to be replaced? I have no real knowledge of radio electronics and am very much an amateur. I am new to this Forum and have joined in order to request assistance / advice which would be much appreciated. Julian