ERICSSON
TELEPHONE No. N1366 - N1371
C. B. Telephones
PLAN NUMBER WORKING
n1366.jpg (11687 bytes) n1368.jpg (11056 bytes)
N 1366 Type N 1368 Type

These telephones are for providing economically various extension schemes without the use of separate switches or switchboards.

They are arranged to accommodate key units having from one to nine spring sets of the make-before-break change-over type, i.e., "K" combination. The spring sets are operated by push buttons, and are illustrated overleaf.

For a simple extension or for recalling a P.B.X. operator the instrument N1366 type has a key unit with one set of K springs.

For other extension schemes the key units have a number of K spring sets, the standards being for 4 and 9 sets. The push buttons on a telephone with a 4K spring set operate respectively (left to right) 2K-1K-1K spring sets, while with a 9K set, 4K-1K-4K are operated.

Each contact spring is wired to a separate terminal so that the scheme in hand may be readily connected up.

On the 4K and 9K key units there is a mechanism which can be varied to control the non-lock or locking of the two outer keys, the centre key being non-locking. There is also supplied with each of these key units a T piece which is fixed to the cradle lever when the extension plan necessitates the release of a key on replacement of the micro-telephone.
Instruments are also available with battery bells so that plans to suit almost any requirement can be arranged.

The telephones are normally produced in black, but if specially ordered, they can be supplied in Chinese red, ivory or jade green. They can also be obtained without the instruction tray and directory pad fitment.

N 20629   N 20630   N 20631
1 K Key Unit   9K Key Unit Mounted   4K Key Unit
n20629.jpg (2961 bytes) n20630.jpg (10565 bytes) n20631.jpg (6363 bytes)

For telephones with two or three push buttons the key unit required must be stated.

In the case of plans requiring only two push buttons, chromium finished dummies can be supplied for the third hole.

The terminal blocks, cords and labels vary according to the plan required, so that full details regarding the scheme to be operated should be supplied when ordering.

Circuit diagrams of various plans can be supplied on request.
Overall dimensions 9.4 x 8.1 x 6 inches.
Maximum weight 6 lb.
The instruments in the table below are complete with instruction tray fitment.

Code No.   Description
N1366A   Black Bakelite, magneto bell, 1 K key unit and button
N1367A Black Bakelite, magneto bell, two buttons.
N1368A   Black Bakelite, magneto bell, three buttons (key unit to be stated)
N1369A   Black Bakelite, battery bell, three buttons (key unit to be stated)
N1370A   Black Bakelite, battery bell, no buttons or keys
N1371A   Black Bakelite, battery bell, 1 K key unit and button


 

Code No. Description GPO No.
N1366B All four standard colours Tele No. 330CB
N1366D Black Tele No. 330CB
N1368D Black Bakelite, magneto bell, provision for 3 buttons Tele No. 328CB
N1369B Black Bakelite, battery bell, provision for 3 buttons Tele No. 326CB

Above telephones were also supplied to GEC, A.T & E, S.T & C and BR (WR)

See N1003 for automatic types

Note - Wall telephones for Plan Number working can also be supplied.

Taken from the Ericsson catalogue, edition No. 49

 
 
Home page BT/GPO Telephones Ericsson Telephones Ericsson Home Page Ericsson PABX All Telephone Systems

Last revised: July 23, 2025

FM2