TELEPHONE No. 711

Diagram for Additional Buttons - N849.

Diagram for Auxiliary Switches - N848.

Circuit diagram - N811.

Drawings - 91796/0, 91797/0 (CB) and 93012 (Automatic).

Specification - S751.

Initially made by GEC - see their TEL/1W and TEL/2W.

As an interim expediency a Telephone No. 1/706 was introduced as a temporary wall phone until the next generation wall phone, the Telephone No. 711 (1961), was introduced.

Superseded Telephones No. 321, 327, 329, 331 and 333.

The Telephone No. 711 started life as the prospective Telephone No. 707.  An initial specification for a new style wall phone to match the Telephone No. 706 was drawn up in late 1959 with the specification released to manufacturers in early 1960.  In April 1960 GEC, AEI and ATE had models on display and by late summer the GEC model was chosen as it was based on the Telephone No. 706 and had provision for four press buttons.

In June 1961 the GPO placed an order for Telephones No. 711 - CB variant in Black (5800), Ivory (7100) and grey (3600) - L variant in Black (11700), Ivory (14400) and Grey (7400).  The GPO supplied (free of charge to the manufacturer) the dials, handset cords, receivers and transmitters.

In early 1963 the Telephone No. 711 was released officially in the UK.

The First batch of "official"  Red cased 711 were issued solely for use in GPO/Post Office buildings for use as Fire Telephones.  They were the Telephone No. 711CB and were used to replace the then obsolete Telephone No. 81 in Exchanges and AMCs.  The later 2nd issue were for issue to the "mail" side of the business (again as Fire Telephones) and these were fitted with a red dial (fitted locally by the installer).  In most cases the blank plate, fitted above the dial, was coloured black but some of the very early ones are red.

The telephone was fitted with a Regulator No. 1A which was produced with a reduced height as there was no room for the upright Regulator No. 1 as fitted to the Telephone No. 706.

Design was processed on SCP182.

Cover removal

1. Locate the single cover fixing screw.  This under the bottom of the cover just in front of the handset cord grommet.

2. Take the handset off the cover.

3. Undo the screw until the head of the screw is just clear of the cover - do not remove the screw completely.

4. Pull the very bottom of the cover away from the base.
5. Once clear of the dial, the case can be pushed slightly upwards and will disengage from the back plate.

TELECOMMUNICATIONS INSTRUCTION
C MARKETING INSTALLATION
3 Internal
Bl004
Issue 3, Nov 1977

TELEPHONE No. 711
Description and Installation

INTRODUCTION
This Instruction describes the Telephone No. 711 and outlines its application and installation.  For use on Automatic Systems the Telephone No. 711 was superseded by the Telephone No 741. (See TI C3 B1025.)

Telephone No. 711 Black	Telephone No. 711 Grey	Telephone No. 711 Ivory

DESCRIPTION
The Telephone No. 711 is a wall telephone incorporating the 700 type telephone circuit.  It is supplied without a cord or a block terminal and cable connections to it are made via a hole in the telephone base.  A Handset No. 3 is used and this rests across the top of the instrument to operate the two gravity- switch plungers.  The two tines of the cradle provide 'off hook' positions for the handset to hang on.

FACILITIES
The Telephone No. 711 is the wall equivalent of both the Telephone No. 706 and the Telephone No. 710 .  It provides for all the facilities offered by the two instruments.  As supplied the telephone is suitable for exclusive service on DEL and PBX extensions where press-buttons are not required.  All other facilities are provided by the addition of various add-on units.  The Telephone No. 711 may also be used on Local Battery Systems.

ADD-ON UNITS
Single Press-Button (as for Telephone No. 706)
When only a single change-over contact is required fit Switch No 5A-3 and Part 1/DBR/381 (see picture describing additional capacitor).

Full circuit details and fitting instructions for these parts are given in Diagram N 811.

Telephone fitted with latching plate all buttons populated
 

Latching mechanism 1/DFR/107 installed and fitted with one press button

One-to-Four Press Buttons (as for Telephone No. 710)
Where more than a single change-over contact is required, fit a Frame and Latching Unit, Part 1/DFR/107.  This unit carries a latch plate similar to that used in the Telephone No. 710 and enables the standard Telephone No. 710 push-button spring-sets to be fitted and the same inter-locking facilities to be provided.  Fitting instructions, latching arrangements and circuit details of the press-button spring-sets are given in Diagram N 848 (see picture above).  The frame is located in the two slots and then held in place by two springs.

Auxiliary Gravity-Switch Contacts
These are provided by fitting auxiliary spring-sets, Part 1/DSP/1501 or 1/DSP/1269.  An auxiliary spring-set combined with an inductor (Adapter, Local-battery, No. 7 or No. 8) is used in local battery exchange areas.  The full range of add-on spring-sets is shown in Diagram N 848.  The spring-set brackets are provided with a slotted fixing hole to facilitate the correct positioning of the contacts.

Additional 2 PF Capacitor
A Capacitor, No. 7712-2 and a Clip No. 90 are fitted.

Capacitor, Paper, No. 7712-2 with Clip No. 90 shown - centre, right.
Switch No 5A-3 fitted on a Part 1/DBR/381 - centre, top

Additional terminals
Fit one or two Parts 2/DST/836 or a Strip, Connection No. 155A (see picture below).

Strip, Connexion No. 155A is show central and a Part 1/DST/836 is show to the right.
A Hook, Receiver AH is shown below the back plate.

Buzzer No. 32C-2
When the telephone is used as the extension of a Plan 105 or, 107 fit a Buzzer No. 32C-2.  To facilitate the fitting of the buzzer first remove the regulator.  The buzzer 32C ... supersedes the 32A...

Thermistor 1A-1
A Thermistor is required when the phone is connected to a Party line.

Lamps
One or two Lamp-fittings No. 17A can be fitted.  The small fixing screw must be fitted in the appropriate screw thread depending on whether it is for left or right hand fixing.  A cover Part 4/DCO/659, with two opals, must be requisitioned separately.  The Lamp-fitting No. 17A uses Lamps No. 41...

Top, centre is a Switch No. 5A-3, mounted on a Part 1/DBR/381.
Centre, left shows an Auxiliary Spring-set, with a Local Battery adaptor below.
To the right of this switch is a Lamp Fitting.
Underneath the central bracket is a Buzzer No. 32A-2

PRESS-BUTTONS
When press-buttons are required the long dummy must first be removed from the telephone case.  The long hole in the case must always be completely filled with either buttons or a button and dummies depending on whether a Part 1/DFR/107 or Switch No. 5A-3 is fitted.  The press-buttons are shown in Diagram N 849.

With Switch No. 5A-3
Fit press-button Part ... /DBU/266 or ... /DBU/267 as required.  The two screws on the Switch No. 5A-3 are loosened and the press-button is placed in the slot between the switch and its bracket.  The screws are then tightened.  The two spring clips, which hold the long dummy in the case, are used to retain two small dummies (Part 1/DBU/270) one at either end of the slot in the case.

With Part 1/DFR/107 the slot must always be completely filled with press buttons.  Part 1/DBU/378 (colour) or 1/DBU/379 (colour).  These are 2 piece buttons, a coloured inner (ivory or grey) and a transparent cover.  A self adhesive label A6644 bearing the required legend is fitted between the 2 pieces.  The label should be requisitioned separately from the local stationary supply point (Stationary Vocabulary Sect M492-10 item 01-3759).  When fitting black telephones, grey buttons should be used.

Part 1/DBU/379 is twice the width of Part 1/DBU/378 and by a suitable selection of these two buttons a balanced layout can be obtained.  A single locking button which operates independently of the latch mechanism can be obtained by using a Part 5/DPL/382 and a Button 1/DBU/378 bearing the legend `ON-OFF'.  To fit Part 5/DPL/382 the appropriate plunger restoring spring is loosened, the plunger is removed and replaced by Part 5/DPL/382.

HANDSETS
Facility Handset No's 4, 5, 6, 7 or 14A may be used with the Telephone No. 711...

ADDITIONAL WATCH RECEIVER
A Receiver, Watch, No. 8T may be used by fitting a Hook, Receiver, AH using the same screw which is used to fix the telephone to its T shaped fixing bracket (the bracket is shown on one of the pictures above).

LAMP SIGNALLING UNITS No's 1 & 2
When fitting these, the connection strip bracket on the Lamp Signalling Unit should be shifted to the top edge of the unit.

INSTALLATION
Each wall telephone is supplied with a special `T' shaped bracket (Bracket, Telephone, No. 16) and screw.  Fix the bracket to the wall using at least two of the four holes provided.  Only two rubber feet are fitted in the telephone base and after the cover has been removed hang the upper two feet holes over the two hooks of the bracket.  Slide the handset cord grommet to one side and with the screw supplied, fix the telephone to the bottom of the bracket through the hole in the cord grommet bracket.  The cord grommet must be centralised before replacing the cover.

When the telephone is being installed in a confined space, e.g. a lift, it may not be possible to use the Cover Retaining Screw 1/DSC/176 (located close to the handset cord entry point).  Where this is the case, a Hexagon Headed Screw 1/DSC/531 which can be tightened with a spanner should be used.

REPLACEMENT PARTS
Part to be requisitioned as:-

The telephone No. 711 is superseded by Telephone No. 741

Transparent case	Unusual red model

Rear view of a Telephone No. 711 showing the wall fitting bracket

The bracket (Bracket, Telephone, No. 16) locates in the top two slots and the bottom of the base is fixed by a screw just above the cord entry hole.

Additional information

Cases
Original Telephone No. 711 cases were Perspex (Polymethylmethacrylate) and had code 12 marked on the moulding somewhere but later they were ABS (Acrylonitrile Butadiene Styrene Copolymer) and marked as code 17 ISTR.

Cases

The Telephone No. 741 case was the almost the same as the Telephone No. 711, except that the Telephone No. 741 version had a rebate about 1.5mm deep and the same wide on the inside edge.   This was all round the face of the body that contacted the chassis.  It allowed for the up-turned edge of the metal chassis (originally designed for the 746) to be snugly accommodated.

A Telephone No. 741 case will fit a Telephone No. 711.  The other way round it depends on which variant of the base is being used.  The metal base became rare as it rattled on the Bracket, Telephone  No. 16.  The plastic bases were proprietary and different moulders had subtly different designs.

Paul Ebling
 

Last revised: July 23, 2024