UK Vintage Radio Repair and Restoration Discussion Forum - View Single Post - Two DSL filters, two 706 phones, bell tinkle

WayneL74 · 14th Jul 2019, 10:51 am

Hi Riccardo.

There is another method you could try which won't involve changing any of your internal wiring.

I have a Planset N625 wired with 2 "external" extensions. These extensions are 2-wire 706 phones effectively wired in parallel.

What the GPO did to eliminate bell tinkle on those was fit a thermistor in series with each bell coil. This causes a slight delay with the phones start to ring (about 1 second) but does stop bell tinkle.

The device you are looking for is a Thermistor 1A-1. These are available from eBay and other GPO spares suppliers.

You would wire it in place of the strap across T4 & T5 is each 706 telephone. You may already have a resistor in place of this strap. If so then post a picture of the wiring of your phones and I can advise how it can be done.

Hope this helps.

Regards,

Wayne

14th Jul 2019, 10:51 am	#7
WayneL74 Triode Join Date: Jun 2015 Location: Ipswich, Suffolk, UK. Posts: 49	Re: Two DSL filters, two 706 phones, bell tinkle Hi Riccardo. There is another method you could try which won't involve changing any of your internal wiring. I have a Planset N625 wired with 2 "external" extensions. These extensions are 2-wire 706 phones effectively wired in parallel. What the GPO did to eliminate bell tinkle on those was fit a thermistor in series with each bell coil. This causes a slight delay with the phones start to ring (about 1 second) but does stop bell tinkle. The device you are looking for is a Thermistor 1A-1. These are available from eBay and other GPO spares suppliers. You would wire it in place of the strap across T4 & T5 is each 706 telephone. You may already have a resistor in place of this strap. If so then post a picture of the wiring of your phones and I can advise how it can be done. Hope this helps. Regards, Wayne Last edited by WayneL74; 14th Jul 2019 at 10:55 am. Reason: Spelling mistake