If you're trying to convert a STEREO output to feed MONO headphones, the best is to use a resistive splitter network as shown.
There are adapters out there that simply short the two L/R signals from the stereo, but you run a risk of overloading the output stages of your amp.
The resistive network places a current-limiting resistor on each stereo output in series, so eliminating shorts and overload.
If using a mic-enabled headset, the jack has 4 connectors, the back one nearest the plastic case being for MIC.
Mono: Tip, Sleeve.
Stereo: Tip, Ring, Sleeve.
Incl Mic: Tip, Ring, Sleeve, Mic.
Tip is Left, usually Green.
Ring is Right, usually Red.
Sleeve is common GND, usually bare copper or black.
Mic can vary according to manufacturer. Seen striped colors, white, red, purple.
These thin shellac-coated wires are sometimes difficult to solder, so here are some tips:
Using a combination of fine emery paper, craft-knife and flame, try to burn/scrape/clean about 5 mm from each wire.
Copper should be shiny without shellac color showing at end.
To burn the shellac off, best hold the wire 5 mm or so back with pliers or fingers. The shellac varnish may ignite the whole wire if you don't block it first.
Diagrams and drawings should help to clarify the text.


![stereo plug connection [png]-amwsxm2bpytpyryuvmyoeb4d-4-2.png](data:image/png;base64,iVBORw0KGgoAAAANSUhEUgAAAAEAAAABCAQAAAC1HAwCAAAAC0lEQVR42mOsrwcAAYMBABbFvRQAAAAASUVORK5CYII=)
This is the picture.
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