Hi John
If the cartridge is a turn-over type, suitable for playing 78s as well as LPs, then it is a ceramic type and the output - in the range 100 - 250 mv - may be too much for your amplifier, and will require a high input impedance in the region of 1 M. A moving coil cartridge of that era has an output in the range 0.5 to 5 mv and can be plugged into phono connectors - left and right stereo. If your hi-fi has no phono sockets, and only AUX sockets, you will need to get a phono pre-amplifier. Not expensive - say £50 - and easy to install. As Bob Collings suggests you can get a reasonably performing record deck from Maplins for £70 which can be played through phono connections or connected to a computer.
Hope that helps
Ernie