Help to Identify

[wdcw]

Help to Identify Circuit

I went to a local rubbish tip today & found a small vented metal box which had 2 4 pin sockets on the rear that looked liked the old 4 pin speaker connectors. On the front there was a numbered dial a switch with a lamp & another unmarked dial.

Anyway I grabbed it & opened it up once at home.

At first it looked like it maybe a small amplifier of sorts but there is an Inductor I think which has contact points on it. Also there is a 6H6GT valve which makes me unsure what it is, so is it maybe an old valve Oscillator or something.

I'm not really sure what it is but someone here may know, I have taken some pictures & attached them.

The Valves are 2 X 6X5G 1 X 12AU7A 1 X 6H6GT & 1 X 6SN7GT.

Cheers

 

[DF96]

Homebrew stabilised power supply? Audio oscillator?

The inductor with contact points is a relay - perhaps a switch-on delay?

 

[el156]

Looks like a intercomunicator ,to comunicate between 2 persons in the same building at a considerable distance with wires conected in those sockets and a volume control_????

 

[el156]

Looks like a intercomunicator ,to comunicate between 2 persons in the same building at a considerable distance with wires conected in those sockets and a volume control_????

The relay could be a speak/listen switch???