Rewireable 3.5mm insulated stereo plug. For use with 3.5mm sockets. Strong plastic barrel. Moulded strain relief.
eBay
AK45/AK35 800W Home Power Amplifier 2 Channel Bluetooth 5.0 Mini Hifi Digital Stereo Sound Amplifier Support FM USB SD Mic input
Aliexpress UK
It is a reasonably robust construction. Crimp type cord grip - use pliers to wrap the cable. Solder connections. Connector Type Plug. Note, you will need a soldering iron to fit this connector. Cable O.D. ≤ 4 mm.
eBay
Woopker 100W HIFI Digital Amplifier TPA3116 Bluetooth Amp Mini Wireless Stereo Audio 2.0 Channel Power Amplifiers
Aliexpress UK
2.5mm Stereo 4 pole connector suitable for headphone inputs. 2.5mm mini jack chassis socket for mounting onto flat panel surfaces. 2.5mm Mini Stereo Jack Socket. 2.5mm Flat Panel Chassis Connector.
eBay
Douk Audio Mini JAN5654 Vacuum Tube Phono Preamp for Turntables Phone/PC/MP3/TV Home Stereo Audio Preamp Headphone Amplifier
Aliexpress UK
2.5mm mini jack chassis socket for mounting onto flat panel surfaces. 2.5mm Stereo 3 pole connector suitable for headphone inputs. 2.5mm Mini Stereo Jack Socket.
eBay
PJ.MIAOLAI 6K4 Vacuum Bile Tube Preamplifier NE5532 OP AMP AUX Bluetooth 5.0 USB RCA HIFI stereo Mini headphone Preamp 16-300ohm
Aliexpress UK
3.5mm Headphone Jack Solder Connector. 3.5mm Stereo 3 pole connector suitable for headphone inputs. 3.5mm Mini Stereo Jack Connector. 3.5mm mini jack connectors for soldering onto cables up to 5mm.
eBay
Fosi Audio Q4 Mini Stereo USB Gaming DAC & Headphone Amplifier Audio Converter Adapter for Home/Desktop Powered/Active Speakers
Aliexpress UK
2.5mm Stereo 4 pole connector suitable for headphone inputs. 2.5mm mini jack chassis socket for mounting onto flat panel surfaces. 2.5mm Mini Stereo Jack Socket.
eBay
Mini Car Amplifier Motorcycle Home Boat Auto Stereo Audio Amplifier 2 Channel Digital Hi-Fi Amp Support CD DVD MP3 Input
Aliexpress UK
Manufacturer Ugreen Group Limited. RCA to 3.5mm Audio Cable: UGREEN RCA to Aux Cable makes it easy to play music from devices of 3.5mm jack on old audio output devices of 2RCA(Red and White) ports, like Hi-Fi amplifier, speaker, turntable, DVD player, AV receiver.
eBay
Mini Amplifier Bluetooth 5.0 Digital Audio Power Class D HiFi Stereo 200W*2 12V/24V Home Car USB Music Sound Card AMP Speaker
Aliexpress UK
You can use this soldering jack to make any 3.5mm connector cable by yourself, and then you can repair your headphones. 36mm Rubber Fuel Pump Holder Mount Car Diesel Air Parking Heater Pump Bracket. A heat shrinkable tube is provided in the solder connector.
eBay
ST-838 HiFi 2.1 Channel Power Amplifier Stereo Bass Sound Amp RMS 20Wx2+40W Class D Mini Media Player MP3 Car Black Home Amplify
Aliexpress UK