How to Replace a Stereo Connector and Salvage Audio Cables and Headphones
Amazon.com: 3.5mm Stereo Right Angle Plug to Bare Wire : 70-3536 (1) : Electronics
Fancasee (2 Pack) Replacement 3.5mm Male Plug to Bare Wire Open End TRRS 4 Pole Stereo 1/8" 3.5mm Plug Jack Connector Audio Cable for Headphone Headset Earphone Microphone Cable Repair - Black :
3.5mm headphone jack wiring installing on amplifier ; high impedance headphones are recommended - YouTube