[russell_w_b]

Originally Posted by dagskarlsen

'...and pretty often on European telephones something disconnecting the ringer when going off hook is pretty common.'

Thanks, Dags. This is what I was on about, and I'm pretty sure there's been a circuit on here of some continental telephones where the bell is routed via the gravity switch.

The other thing I neglected to mention is that d.c. should not flow through the receiver or it will eventually become depolarised. On the 706 instrument hitherto described, this would amount to a quiescent d.c. of about 23mA if the capacitor was shunted by the speech network.