[Studio263]

Another problem I can see is that the ceramic cartridge in the record player needs to be connected to a high impedance input - 1Mohm or more. The Cambridge amplifier is designed for modern sources so will probably have an input impedance of around a tenth of this figure - good for its intended purpose but not much help to you here.

Of course it isn't that complicated to make a unity gain follower circuit based around an FET input op amp IC (TL072 etc), mount it in the bottom of the record player cabinet and wire this in line with the cartridge outputs, perhaps making use of the redundant microphone input socket. However, once you've done all that you still end up with something that will sound disappointing through your more modern amplifier and loudspeakers - a budget turntable with a magnetic cartridge from a slightly later era and a basic RIAA pre-amplifier would make more sense from a practical point of view.