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IT 3101 - IT 3204, TEL/7D, TEL/8D, TEL/15D & TEL/16D

In 1955 GEC decided to renumber all their telephones with the prefix TEL.  The IT 3101 - IT 3204 range, which were the original 1947 catalogue numbers for these telephones were part of this renumbering.  Please see the table below for more information.


Rapid internal communication, established by a single touch of the fingertip, is the feature of this new G.E.C. Intercommunication Telephone System. Operating on the push-button principle, it combines simplicity and economy with a high-efficiency performance.

No exchange is required. Installation entails only the connexion of the instruments with the special G.E.C. cable, and is explained in detail on Leaflet IML 115 supplied with each instrument.

The instruments are in two sizes, one for a maximum of 10 lines (total of 11 stations) and the other for a maximum of 20 lines (total of 21 stations). Economy in first cost can be obtained because a system can be installed for less than the maximum number of lines and later extended as required up to capacity.

For small businesses the intercommunication telephones can provide all the internal communication necessary. For larger businesses the telephones are an invaluable auxiliary to the main internal telephone system, giving immediate communication between selected parties.

Nothing could be easier to use!

Calls are made by lifting the handset and pressing the appropriate button. Pressure on the button operates a buzzer at the called station, and the buzzer is heard as long as the pressure is maintained.

Release of the finger pressure allows the button to fall into a locked position. where it remains until automatically restored by the replacement of the handset at the conclusion of the conversation.

When a call is received, lifting the handset completes the connexion.

The Instruments
The telephone sets are smart, attractive instruments, with polished black bakelite cases, free from slots, grooves and other dust traps. The handset is a special G.E.C. design, as efficient as those supplied for use in public telephone systems all over the world.

Transparent labels cover the name panels and ensure an unsoiled appearance even after long use.

The instruments are suitable for either table or wall mounting. Apart from altering the positions of the labels and omitting or including the terminal strip and its cord, no modifications are necessary to effect the change in style of mounting.

Economy - There is no more economical system with the same scope. The absence of exchange equipment means low initial cost and low upkeep expense.

Simplicity - In operation, the system is foolproof. It is both swift and sure and responds instantly to the touch of a button.

Reliability - The system is backed by the long experience and integrity of the G.E.C. Into its design and manufacture go the same care and attention to detail that are features of the G.E.C. apparatus and equipment supplied to the large public systems.

Power Supply
A minimum of 7.5 volts DC is required to operate the system, and can be derived either from AC mains (100 or 200/250 volts) unit Cat. No. SU1301, which has been specially designed for working with this intercommunication system, or from a battery of dry cells. Suitable cells are the G.E.C. 1.5 volts (7" x 2.6") round-cell type or any other good make having a similar capacity.

Maximum distance with one 6 volt source in the middle is 150 yards.

IT3101 IT 3103

Catalogue Numbers
(Numbers in brackets are from the 1955 and ITL 1C Catalogues)

  Catalogue Numbers
10 Line 20 Line
Table Wall Table Wall
Standard Finish IT 3101
IT 3102
IT 3103
IT 3104
Tropical Finish IT 3201
IT 3202
IT 3203
IT 3204
Weight lbs 8 7.4 8.9 7.9

This series of telephones was introduced in 1947.

Click here for a GEC Current Comments article

Taken from the GEC Catalogue Leaflet ITL 1 (IT 3101 - IT 3204)
Taken from the GEC Catalogue No. 28 (1955) (TEL/7D - TEL/8D)
Taken from the GEC Catalogue Leaflet ITL 1C (TEL/15 - TEL/16D)

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Last revised: November 26, 2021