Jack Unit No. 1A and 1B

Jack Unit No 1A and 1B are generally used in conjunction with a Telephone No. 713 and a Mounting Dial Automatic No. 21.  A handset or headset can be plugged into the socket.

The unit comprises of a telephone circuit similar to that of any 700 type telephone, except that it obviously does not have switch hooks, handset or a dial.

The Jack Unit No. 1B is similar to the 1A except it has a printed circuit board and a Regulator No. 6B fitted.

Last revised: November 28, 2010