There are some older audio video receivers that have phonostages. Does yours? There would be a pair or input RCAs labeled phono and a grounding post nearby on the back if so. If not you will need a separate phonostage (phono preamplifier). Phonostages built into TTs are not of highest quality.
I am not familiar with your Pioneer TT, however I would break it out, clean it up, and check it out for function using an inexpensive cartridge. Often they just need a belt.
I am not familiar with your Pioneer TT, however I would break it out, clean it up, and check it out for function using an inexpensive cartridge. Often they just need a belt.