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What kind of device is it?


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Can somebody identifi this device?

 

Carrier telephony equipment. At a guess it's "Balance Filter Unit !+! Mk.1*" and probably rather heavy - full of soft iron cored inductors and block paper capacitors.

 

The "1 + 1" means 1 audio plus 1 carrier circuit on the same set of wires.

 

The "Phantom" part refers to a separate circuit, usually between two pairs or one pair and earth, used by the engineers for testing and fault reporting (the "order wire').

 

Best,

Chris.

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