Re: GPO Telephone 746. New member.
You also probably need to be aware that exchange equipment sometimes reverses the polarity on the line for testing purposes, and this may conceivably also result in a ting. I have never experienced this with a 746 myself, but I did have a Trimphone that emitted a short "beep" when this occurred. As I had this as my bedside 'phone initally, it soon got swapped with one elsewhere in the house.
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Mending is better than Ending (cf Brave New World by Aldous Huxley)
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