Re: REN, Resistors &c.
The above presumably relates to ringers in series, given that this was the norm in the days before plug-in 'phones, where the greater proportion of the ringing voltage would be across a high-impedance ringer. A slightly different situation arises with the present arrangement of parallel ringers where the greater proportion of the available current will pass through the low-impedance ringer, which is significant if the load causes the total voltage to drop. The situation encountered by els1967 may be that the 312 was more tolerant of a reduced voltage than was the answerphone.
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