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

Dave Moll · 24th Sep 2018, 2:00 pm

Are you sure it's a matter of line voltage? It may be that ringing is via a third wire (usually coloured blue if the line wires are red and white). The ringing voltage is applied to this wire via a capacitor of up to 1.8μF from the "B" leg (usually red) of the line. In the UK this is achieved either by use of a master socket containing the appropriate components or by an ADSL microfilter (most UK ones including a ringer capacitor).

24th Sep 2018, 2:00 pm	#2
Dave Moll Dekatron Join Date: Feb 2005 Location: West Cumbria (CA13), UK Posts: 6,127	Re: Old telephone won't ring Are you sure it's a matter of line voltage? It may be that ringing is via a third wire (usually coloured blue if the line wires are red and white). The ringing voltage is applied to this wire via a capacitor of up to 1.8μF from the "B" leg (usually red) of the line. In the UK this is achieved either by use of a master socket containing the appropriate components or by an ADSL microfilter (most UK ones including a ringer capacitor). __________________ Mending is better than Ending (cf Brave New World by Aldous Huxley)