UK Vintage Radio Repair and Restoration Discussion Forum - View Single Post

Oldcodger · 25th Mar 2018, 10:42 pm

Let me throw a couple of ideas into the hat for consideration.
746 wall telephone- I've seen an old 700 wall type fail to ring. The customer wanted a Pl 1A on installation, and on ringback test, the new phone rang, but original failed to ring. I consulted the local maintenance man, and the customer had had this problem for some time, New wall phone- problem solved- thought was that bell was polarised.
Second idea- ring trip- caused by too many capacitors in the circuit. OR a fault, known as rectified S/C which causes ring trip.

25th Mar 2018, 10:42 pm	#8
Oldcodger Nonode Join Date: Oct 2014 Location: West Midlands, UK. Posts: 2,181	Re: Calling the old BT technicians... Let me throw a couple of ideas into the hat for consideration. 746 wall telephone- I've seen an old 700 wall type fail to ring. The customer wanted a Pl 1A on installation, and on ringback test, the new phone rang, but original failed to ring. I consulted the local maintenance man, and the customer had had this problem for some time, New wall phone- problem solved- thought was that bell was polarised. Second idea- ring trip- caused by too many capacitors in the circuit. OR a fault, known as rectified S/C which causes ring trip.