telehpone call magnification circuit

[aboalghadb]

I found this circuit in old book about electronics and this circuit related to PHILIPS company.
this circuit is used to magnificate the telehpone call when it put beside the telephone.
I want to ask about the transformer coupling i don't find it . how can i make it or replace by R coupling or RC coupling ?
i need help
the picture is attached

 

[Hero999]

The circuit is really old, early 1960s.

It uses poor quality germanium transistors and a distorting audio transformer both of which will be very expensive.

Use a modern op-amp such as the TL071 which can drive 2k headphones directly or add an LM386 to power pair modern 32R headphones.

 

[Willbe]

You can get mag pickups for telephones complete with suction cups. Putting it over the earpiece gives you the benefit of the phones internal anti-sidetone circuit.

 

[audioguru]

Old phones sprayed a magnetic signal all over the place. Then this old circuit worked fine.

Some modern phones do not have an earpiece that produces a magnetic signal for a coil to pick it up. They must be labelled, "hearing aid compatible".