[AndiiT]

Great sets, I owned one many years ago. As Ben has already mentioned you can use the 8 pin A/V socket to feed composite video and audio signals to the set - from memory you need to apply around 9 to 12 volts to one of the pins on the A/V socket to allow channel position 8 (it may be 0) to be used as the external input position, when you do so an additional dot will appear on the channel number display to indicate the set is in AV mode.

You can apply the voltage either from pin 8 of the source equipment SCART socket or link two of the pins on the A/V socket (1 and 7 I think, best to check though) as there is a 12 volt supply available on the socket.

Andrew