Help identify this audio electrical connector
That is a 1/4&quot; Mono Jack sometimes also called a 1/4&quot; Phone Jack.
It takes a 1/4&quot; Mono Plug.  (These are very common)
The circuit symbol looks like this:



See above.  The upper terminal is the signal, and the lower is 'common'
That is just the 1/4&quot; female mono (or phone) jack

Look HERE for an example.  These are extremely common and should be easy to find.
These are the same as the old-fashioned headphone jacks/plugs from many decades ago.