Headphone/microphone hearness for # 19

[Bob Carriere]

I am trying to test out old dried up spare headphone sets and hopefully understand how they work.

I need a schematic of the wiring as I am totally frustrated.

I have rigged up an old transistor radio to provide the suitable signal from the earphone jack.

My frustration is that I can make the earphone work if I connect directly to the earphone contacts but cannot make them work from the brass contacts on the rubber snatch plug.

There are 5 wires in the loom .... black-white-red-blue-green...... I suspect one wire does double duty or something.....

Black goes from snatch plug to one connection on the earphone(1) them doubles back to the microphone. A blue goes from the other connection of the same earphone(1) to the other earphone(2)... the other contact of earphone(2) is green........ but if I apply power/sound to the black and green wire of the snatch plug it does not play.

To the microphone goes 4 wires.... white-red-black and blue.....

Or am I going cross eye and colour blind....

Bob C.
a.k.a sparky on training wheels.