All models of Magic TV do NOT have analogue tuning feature.
MTV8000D Now TV / Cable TV recording feature is meant for people who subscribed to those services and have corresponding Now TV / Cable TV decoders - these can be connected to the MTV8000D input using HDMI.
If it is really a "cable", not a box, and does not require a power supply, it will never work - because it is not designed for this purpose. Based on my observation, over 90% of such products are made for connecting a HDMI-output (e.g. game console) to an old TV with component or AV input - NOT the other way round, not the direction you need.