Western Electric audio coupler ... Wanted

[Bob777]

I think it might be called a QKT. Not sure though. But I have two pictures attached.

Thanks for any help.

Bob[attachment=1:m1fvdqhl]QKT1.jpg[/attachment:m1fvdqhl][attachment=0:m1fvdqhl]QKT2.jpg[/attachment:m1fvdqhl]

[5B4AJB]

An audio coupler is pretty straightforward to construct, basically just a 1:1 isolation transformer with sockets each end.
There might be some simple filters either end to cut down on hum or restrict the bandwith.

If you can find a similar looking case, maybe you could build a new one