On Friday, April 3, 2015 at 10:08:56 PM UTC-7, Tom Miller wrote:
"2phar" wrote in message
...
Hi group..

There are seven of these sockets within a 1964 built house in Michigan
USA:

"http://i60.tinypic.com/2628481.jpg"

Four in the corners of the living room, and three in the master bedroom.

I haven't had much success yet tracing where they lead to using a toner.
There doesn't appear to be any central point they all end up. Each one
has two solid core wires soldered to it on the back side. Looks like
they were installed with the original build of the house - the wires
from each seem to route through the walls.

I initially thought they were DIN loudspeaker connectors, but as you
can see the two contacts are both flat. The centres of the two contacts
are about 7mm apart.

Anyone know what they might be?

TIA

Jones connector.

Male:
http://www.newark.com/cinch/p-302h-a...ion/dp/11M5827

Female
http://www.newark.com/cinch/s-302h-a...t-2/dp/12M1388


HTH

First see if there's any AC or DC voltage on those pins. Then see if there's any low-ohms resistance (like a loudspeaker or amp transformer connected somewhere.) It might connect to a DIY intercom system.

Could even be telephone. Back before mid-1970s, only the rich had telephone connectors, so people might be tempted to install their own, so they could carry a landline phone all over the house and plug it into their connectors.


As others point out, could be a custom loudspeaker installation so one main amplifier can send music to many rooms.