TELEPHONE No. 9701
(Telephone No. 9701)
This is a press button 10 pulses per second signalling telephone intended for the residential market.
Colours: Biscuit, Red, Black, Almond and Blue
Approval number: S/1000/3/F/500162
Made by Northern Telecom and BTCE Cwmcarn (Manufacturers code FWG)
Seized - Normal off-hook press button telephone loop. The electronic keypad and
transmission circuitry may give high resistance telephone-loop line test conditions as with
other press button telephones.
Early version Telephones No. 9701 (Item coded 870176, 870177, 870163) were withdrawn from new supply during August 1986 for rework to overcome magnetic problems with the handset.
Later versions (Item coded 877115, 877116, 877117) were withdrawn from new supply during January 1987 for modification to prevent cords from being unplugged from the telephone without the use of a tool.
Models that have been modified to overcome this later problem are marked with a yellow spot on the box and instrument base for identification, models produced during 1987 will incorporate modified cords on production
Modified and new models will continue with the existing Item Code numbers.
Tremolo telephones manufactured by Northern Telecom prior to 1986 week 32 have good RF1 immunity from 100kHz to 10Mhz but poor immunity to higher frequencies. Those manufactured since 1986 week 32 have fairly good RFI immunity from 100kHz to 150Mhz and may be identified by the year and week marking (i.e. first digits of the eleven digit serial number) on the base of the telephone.
All Tremolo telephones manufactured by BTCE Cwmcarn have fairly good RFI immunity from 100kHz to 150Mhz.
Telephones No. 9701 manufactured before week 43 of 1986 may cause 'repeated digits' to be pulsed out when making outgoing calls, resulting in `wrong number complaints'. Models made after this date should not be affected. There will be no dual signalling or MF4 signalling versions of Tremolo.
Northern Telecom also adapted this telephone into a phone called the Ireland Dial Phone. Click here for more details
Last revised: April 23, 2021