UK Vintage Radio Repair and Restoration Discussion Forum - View Single Post

OscarFoxtrot · 27th Jul 2018, 1:59 pm

I have some BT handsets with the armoured cord as used on Payphone 500 / 600 (the 700 style handsets, not the flat angular ones)

They are of course riveted shut preventing internal examination. They have 6 wire cords (red, grn, blu, whi, org, blk)

Are these standard 700 style inserts and on the standard colours red+grn for receiver, blue+white for xmtr? as I am having difficulties getting them working.

On one of them red+grn makes the mouthpiece work as a receiver.

I want to repurpose them for the Pratical Wireless 741 op-amp intercom requiring 700 type circuitry.

27th Jul 2018, 1:59 pm	#1
OscarFoxtrot Heptode Join Date: Apr 2011 Location: Edinburgh, UK. Posts: 805	Payphone 500 / 600 handsets I have some BT handsets with the armoured cord as used on Payphone 500 / 600 (the 700 style handsets, not the flat angular ones) They are of course riveted shut preventing internal examination. They have 6 wire cords (red, grn, blu, whi, org, blk) Are these standard 700 style inserts and on the standard colours red+grn for receiver, blue+white for xmtr? as I am having difficulties getting them working. On one of them red+grn makes the mouthpiece work as a receiver. I want to repurpose them for the Pratical Wireless 741 op-amp intercom requiring 700 type circuitry.