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Dave Moll · 17th May 2020, 2:32 pm

Of course, Pip is quite right that R1 (150Ω) in series with the 156Ω (ish) between tags 2 and 3 of the induction coil should give a total DC resistance a little over 300Ω. It may be worth checking out the induction coil for continuity.

My apologies for forgetting about the components in parallel with the receiver.

17th May 2020, 2:32 pm	#16
Dave Moll Dekatron Join Date: Feb 2005 Location: West Cumbria (CA13), UK Posts: 6,127	Re: Quiet or no dial tone in a GPO 706 Of course, Pip is quite right that R1 (150Ω) in series with the 156Ω (ish) between tags 2 and 3 of the induction coil should give a total DC resistance a little over 300Ω. It may be worth checking out the induction coil for continuity. My apologies for forgetting about the components in parallel with the receiver. __________________ Mending is better than Ending (cf Brave New World by Aldous Huxley)