UK Vintage Radio Repair and Restoration Discussion Forum - View Single Post - Linesman's Telephone 704C circuit diagram

G0FZF Carl · 13th Feb 2019, 12:12 am

I have acquired a linesman's field telephone number 704C. The telephone is in good condition and seems to be working. The 704C has an extra push button switch to provide a 20mA line current. Part of the circuit diagram stuck to the lid is missing and the rest of the circuit diagram is in very poor condition. The user instructions label stuck to lid is also missing some of the text. I have managed to find the diagram for a 704B, but the 704B does not have the circuit for the 20mA line current. Does anyone have a circuit diagram / user instructions for the 704C telephone. Any help finding a diagram would be much appreciated.

13th Feb 2019, 12:12 am	#1
G0FZF Carl Diode Join Date: Feb 2010 Location: Oldham, Greater Manchester, UK. Posts: 5	Linesman's Telephone 704C circuit diagram I have acquired a linesman's field telephone number 704C. The telephone is in good condition and seems to be working. The 704C has an extra push button switch to provide a 20mA line current. Part of the circuit diagram stuck to the lid is missing and the rest of the circuit diagram is in very poor condition. The user instructions label stuck to lid is also missing some of the text. I have managed to find the diagram for a 704B, but the 704B does not have the circuit for the 20mA line current. Does anyone have a circuit diagram / user instructions for the 704C telephone. Any help finding a diagram would be much appreciated.