For use when you are near telephones and other electrical coils etc, for compatibilty with inductive loops
The reason being you end with feedback(high pitched squealing) on the hearing
When you go to the bank or Post Office they have counters especially equiped for hearing aids. These are marked for use with hearing aids so you move the switch to “T” to enable you to hear the teller
If you listen to amplified sound with a hearing aid, there is a deterioration in the sound quality because it comes out of a loudspeaker then goes into the hearing aid microphone. The T position switches the hearing aid to a pick-up coil. Originally this interacted with the earpiece coil on old-fashioned telephones to make a transformer and greatly improved the sound quality.
Modern telephones are made differently so they have a specially designed coil to work with a hearing aid. You’ll find that it doesn’t work with most mobiles, but if you’ve got a PDA you can get a special pickup that plugs into the headphone socket.
Most cinemas, theatres and churches now have a “hearing aid loop” on the sound system so you can enjoy better quality sound. So originally the T stood for telephone, now it just means T.
February 9th, 2010 | 
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For use when you are near telephones and other electrical coils etc, for compatibilty with inductive loops
The reason being you end with feedback(high pitched squealing) on the hearing
When you go to the bank or Post Office they have counters especially equiped for hearing aids. These are marked for use with hearing aids so you move the switch to “T” to enable you to hear the teller
If you listen to amplified sound with a hearing aid, there is a deterioration in the sound quality because it comes out of a loudspeaker then goes into the hearing aid microphone. The T position switches the hearing aid to a pick-up coil. Originally this interacted with the earpiece coil on old-fashioned telephones to make a transformer and greatly improved the sound quality.
Modern telephones are made differently so they have a specially designed coil to work with a hearing aid. You’ll find that it doesn’t work with most mobiles, but if you’ve got a PDA you can get a special pickup that plugs into the headphone socket.
Most cinemas, theatres and churches now have a “hearing aid loop” on the sound system so you can enjoy better quality sound. So originally the T stood for telephone, now it just means T.