PLESSEY TELEPHONE No's N1025 & N1386 - N1389


AUTO. OR C.B. GENERAL SERVICE (1000)

n1025a.jpg (11306 bytes) n1386a.jpg (9363 bytes)
Type N1025A Type N1386A

These telephones, known as "1000 type" because of their suitability for lines of up to 1000 ohms loop resistance, are the complete answer to modern needs. They are efficient in operation, shapely and compact, and are made in the following colours to suit any scheme of interior decoration.

SINGLE COLOUR TELEPHONES

Ref   Cords
(a) Black, with stainless steel dial finger-plate   Black
(b) Ivory, with stainless steel dial finger-plate   Maroon
(c) Imperial red throughout   Maroon
(d) Colonial blue throughout   Silver grey
(e) Topaz yellow throughout   Green
(f) Silver sage throughout   Silver grey
(g) Forest green throughout   Green

DUAL COLOUR TELEPHONES

Case   Handset and Dial Finger-Plate   Cords
(h) Aircraft grey-green   Forest green   Green
(j) French grey   Elephant grey   Silver grey
(k) Blush ivory   Maroon   Maroon

A dial finger-plate of stainless steel instead of coloured plastic can be provided for any telephone.

On C.B. telephones the dial dummy is the same colour as the handset.

High transmission efficiency is achieved by using a new type handset containing a rocking-armature receiver in conjunction with a closed-iron-circuit type of anti-side-tone induction coil.

The handset has a more hygienic mouthpiece than those of earlier types and is shaped for maximum comfort and clarity of speech.

Through ventilation of the telephone is provided via gauze-screened metal ventilation cups inserted one on each side of the case. These cups are also useful as finger grips when lifting the instrument and are coloured to match the handset.

The internal apparatus is mounted on the metal base which has rubber feet and is secured by four captive screws to the case. Removal of the case allows access to all parts for maintenance.

Cradle-switch springs are operated by twin plungers bearing on rollers attached to a hinged plate.

The trigger dial of the auto set has standard numbering and impulse ratios unless otherwise ordered.

Desk and handset cords enter the case via a rubber protector. They have p.v.c. insulated conductors and a close braided cover. All connecting wires are p.v.c. insulated.

Line connections are made at screw terminals in a moulded desk terminal block of the same colour as the telephone case.

Orders for these telephones should quote Type No. and colour reference letter, e.g., N1025A(a).

Similar telephones with push buttons can be supplied for extension, etc., schemes.

Type No.   Telephone   Dimensions   Weight lb. kg.
N1025A   Auto   9.5 in. x 9 in. x 6 in. (241 x 229 x 152 mm.)   4.9 (2.21)
N1386A   C.B.   9.5 in. x 9 in. x 6 in. (241 x 229 x 152 mm.)   4.5 (2.04)
N1387A C.B. As N1386 but with 1 press button
N1389A C.B. As N1386 but with 3 press buttons

Taken from the Ericsson catalogue No. 55

Click here for an article from the Ericsson Bulletin


To convert an N1025A1T (Diagram N89943) to UK Plug and socket working

The terminals are labelled A1 to A7 on the left of the phone and 1 to 7 on the right.

  1. Remove the old line cord.
  2. Remove strap between terminals A2 and A5.
  3. Insert a strap between terminals A2 and A3 - may exist already.
  4. Connect 3.3k resistor between terminals A6 and A7.
  5. Connect White of the new line cord to terminal A6.
  6. Connect Red of the new line cord to terminal 7.
  7. Connect Blue of the new line cord to terminal A2.
  8. Insulate the Green of the new line cord - not used.

Click here for a conversion kit

 

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Last revised: November 17, 2007