gec.gif (1164 bytes)GEC 1100

G.E.C. 1100 Telephone

The G.E.C. 1100 telephone is the ultimate in the design of automatic dial instruments. In this era of plastics, the fullest possible use has been made of them. The handcom and case are of Acrilo Butrate Styrene, (A.B.S.) a high impact thermoplastic, that is colour fast and scratch resistant. Plastic has been used extensively in the construction of the dial which can be fitted for operation at either 10 or 18 impulses per second.

The perimeter of the finger plate is "spoked" so that the digits can be more easily seen without resorting to an external number ring. This reduces the likelihood of subscribers dialling the wrong numbers. The arrangement and type of characters can be varied to suit special requirements.

The new single-coil ringer is as sensitive as that used in the "G.E.C. 706" telephone and is fully interchangeable with it.

All components including the dial, are mounted on the base plate and are easily accessible, for maintenance by the loosening of two screws on the cradle, which allows the case to be removed without inverting the telephone.

Like the "G.E.C. 706", the "G.E.C. 1100" telephone has a modern, pleasing appearance and is comfortable to use. The colour arrangements ensure that there is a good choice to harmonise with any surroundings. The finger restraining ring around the dial finger plate both enhances the appearance of the telephone and ensures that the finger will not slip during dialling.

The handset has been designed to give not only the greatest comfort to the user, but also maximum efficiency from the transmitter. The shape ensures that when the receiver is held to the ear in the normal manner, the transmitter is naturally located in the most effective position. Compared to previous instruments, the handset is very light in weight and access to the receiver and transmitter capsules is gained simply by unscrewing the earpiece and mouthpiece.

The transmitter is a new G.P.O. approved design that gives clearer and more intelligible speech due to lower amplitude distortion and a wider and smoother frequency response. The new arrangement of carbon granules and electrodes ensures a more stable performance during the many variations of angle of the handset in use.

The receiver is of the new rocking armature capsule type and has a very high electro-acoustic conversion ratio. Acoustic equalisation produces an improved frequency response and the light-alloy diaphragm increases the ratio of effective area to effective mass. The magnet is stabilised during manufacture, so that it has optimum strength.

The whole improvement gained by use of this receiver is not needed on the receiving side, therefore, a new induction coil has been designed to transfer some of the improvement to the transmitting side.

In effecting the transfer of gain from receiving to sending side, the highest practicable degree of sidetone suppression has been maintained. The circuit is designed to give maximum suppression of sidetone on reactive lines (i.e. cable pairs), since the vast majority of telephones are connected to their exchange by multi-pair cable.

The dial used in this telephone is a completely new G.E.C. design, which uses new materials and a new action, and has the same reliability and efficiency as its well-known forerunner, the G.E.C. trigger dial. The new dial can be supplied for operation at 10 or 18 impulses per second; the normal make to break ratio is 2:1, but on request other ratios can be provided.

A new "spoked" plastic finger plate is fitted which gives a clearer view of the digits on the number ring without having to use a separate outer number ring. The dial is lighter in weight than its predecessors.

A light plastic cover can be fitted to the back of the dial to provide protection of the mechanism against dust. The connexions to the dial are in the form of a cord included in the cable form for the telephone.

The ringer is also a new design (shown pictures to the right). It is a single coil type having a d.c. resistance of 1,400 ohms with an impedance of 17,000 ohms at 1,000 c/s. It responds to alternating ringing current from hand or automatic ringing machines and has an optimum response at 25c/s. Coils of higher impedance for multi-party working can be fitted when required.

The cradle switch has been designed to eliminate any likelihood of sticking plungers. A new type of springset is fitted which still retains the twin contact effect, but gives more control over the adjustment and tension of the springs. A transparent plastic cover is fitted over the springs to prevent dust accumulating on the contacts.

To avoid excessive volume on short lines caused by the high efficiency of the "G.E.C. 1100" telephone, a circuit shunt is fitted. This can be easily disconnected when maximum volume is required. Alternatively, a fully automatic volume regulator can befitted, or supplied separately, when specially ordered.

The G.E.C. 1100 telephone is designed and fully tested for service in any climatic condition throughout the world. Special insulation is included, as well as adequate ventilation and protection against humidity.

The handset is connected to the instrument by a special P.V.C. covered coiled cord supplied in colour to match the handset. The rosette cord is also covered in P.V.C.

A Magneto Extension Bell in the G.E.C. Catalogue No. BE1100 or BE1200 series, can be supplied when specified to provide calling signals at a distant point or to augment calling signals in very noisy surrounds.

The G.E.C. 1100 telephone can be supplied in the following colours:-
Black, Two-Tone Grey and light Ivory.
Other colours can be supplied against request.

All mouldings are in modern plastic materials having high impact strength and a high degree of colour fastness (thus ensuring good colour matching when replacing parts)


Please state on enquiries and orders: Catalogue number, Colour, whether regulator is required and characters to appear on number ring. (Unless otherwise specified, number rings are numbered 0,9 .. .. .. .. .. 1 clockwise).

Take from The GEC Catalogue Leaflet STL19A - Click here for more

Circuit diagram

Circuit diagram - KS13418


GEC Telephones 1100 and 1200 overview

The GEC Telephone 1100 was an attempt to simplify the design of the Telephone No. 706, using a single coil ringer mechanism and a 'circuit shunt' instead of the normal current regulator.  By far the most striking change was the 'spoked' dial, which was said to make the digits more visible without resorting to a separate number ring.  The dial could be supplied to produce either 10 or 18 impulses per second.  The blank plate on top of the case was also slotted to allow for ventilation.

But, the TEL/61K/ATS did not have a spoked dial and is more or less a GPO Telephone No. 706.

Two-tone grey, black and ivory.

GEC's subsidiary, the Reliance Telephone Company, certainly used them but not widely.  The product appears to have been a failure.

Catalogue Number:

See brochure photograph below.

The Telephone No. 1200 was GEC's own version of the Post Office Telephone 706, also known as the 'New Gecophone'.



Production model showing the typical 700 type layout with the new ringer.


A prototype is shown above.
The capacitors are non-standard, the switch hook contact set is located between the upstands and there is no regulator.

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Last revised: February 16, 2023