Since you are asking, I assume you have no experience soldering tonearm leads?
Look first to see if the leads are connected by push on terminals at the headshell and cartridge. If so, remove and replace all headshell leads with a better set. Solder problem solved and (likely) better sound.
If soldered at headshell, maybe another headshell with new leads will fit the arm? Last, if soldering the broken lead turns out to be the best option DO NOT solder it while connected to the phono cartridge.
If you lived near me, I would do this for free. Would not take five minutes and I have a high quality Hakko solder station and several kinds of solder.
Look first to see if the leads are connected by push on terminals at the headshell and cartridge. If so, remove and replace all headshell leads with a better set. Solder problem solved and (likely) better sound.
If soldered at headshell, maybe another headshell with new leads will fit the arm? Last, if soldering the broken lead turns out to be the best option DO NOT solder it while connected to the phono cartridge.
If you lived near me, I would do this for free. Would not take five minutes and I have a high quality Hakko solder station and several kinds of solder.