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A common problem with these old Thorens tables is the internal wiring could be frayed or totally broken off all the way back to the Arm connection..I had the same problem with my old TD 160 and found the left channel had a disconnected wire at the terminal junction..Once I resoldered the problem went away..Its still possible the cartridge is bad but don't rule out internal interconnect failure........
It's pretty easy to test if the cartridge is failing. Change the connections at the cartridge while leaving the turntable rca's plugged into their current location. With the phono preamp turned off, of course, swap the red and white leads and then swap the blue and green leads. This swaps the left and right channel of the cartridge.
If the same speaker has sound as before the swap, then the cartridge is OK and the fault lies with the tonearm cabling. If the sound now comes from the other speaker, then the cartridge is the culprit.
If it is the cartridge, you won't be able to fix it with a new stylus, you will need a whole new cartridge.