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Old 18th Mar 2017, 8:17 pm   #31
Pellseinydd
Heptode
 
Join Date: Jul 2007
Location: Flintshire, UK.
Posts: 707
Default Re: GPO Jack unit 1B

The circuit in message 15 works - it is the circuit of the Tele 787 modified to remove the coinbox elements. Bell only added if needed.

I've just set it up as per the circuit in Msge 15 with a Tele 713 and a Jack Unit 1B - luckily I had some Tele 713s and Jack Units 1B in the 'Stores' . And it worked first time.

Dialling tone loud and clear on lifting the handset.

Replaced handset and dialled into the circuit the Tele 713/Jack Unit1B was fitted to and it rang out until I lifted the T713's handset and was able to speak between the two phones.
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