13-05-2015, 09:32 PM
That is a MK2 chassis and should have 3 AF117s.
I usually use two NiMh cells with the positive connected to the chassis and probe the three electrodes but do not touch the screen terminal as this will short circuit the battery.
This usually clears the problem without removing the transistors. The other problem that can trouble these sets is the detector diode hidden inside a transformer going open circuit. Fortunately the new one can usually be added leaving the old one in place as it usually fails open circuit or to no connection.
I usually use two NiMh cells with the positive connected to the chassis and probe the three electrodes but do not touch the screen terminal as this will short circuit the battery.
This usually clears the problem without removing the transistors. The other problem that can trouble these sets is the detector diode hidden inside a transformer going open circuit. Fortunately the new one can usually be added leaving the old one in place as it usually fails open circuit or to no connection.
