28 Mar
2014
28 Mar
'14
1:38 p.m.
Sounds like the obsolete standard slightly-smaller
plug you still find on aviation headsets. I've also seen that on WW2 era transmitters
or receivers; forgot the details but it might be that 1/4 inch was used for headphones and
the smaller one for the microphone, or perhaps one was for headphone and the other for
telegraph key.
That is the PL-68, and for an obsolete standard, people sure do still want them.
They are for microphones.
--
Will