TELEPHONE No. 328

Introduced in 1937, this combined table handset telephone (with magneto bell) was used in both CB & Automatic exchange areas on extension plans.

This telephone had a tray for the subscribers personal directory but as from June 1940 the tray was not fitted and instead the telephone was supplied with a Tray, Dummy, D62099 (a blank plate). This was probably a war time cost saving, as in late 1947 the tray was re-introduced.

There is provision in the case for three keys/press buttons. A key unit is fitted on the internal chassis.

The original telephone used a Coil, Induction No. 22, but this was replaced by the Coil, Induction No. 27 later in life. The wiring never changed.

Mark 1 - has a Receiver, Inset No. 1L in the handset and switch bracket with plungers of the early type.
Mark 1A - has a Receiver, Inset No. 1L in the handset and switch bracket with plungers of an improved type.
Mark 2 - has a Receiver, Inset No. 2P in the handset and switch bracket with plungers of the early type.
Mark 2A - has a Receiver, Inset No. 2P in the handset and switch bracket with plungers of an improved design.

Telephone included:-
1 x Bell No. 59A, Unmounted.
1 x Bell-gong No. 2.
1 x Bell-gong No. 2A Nickelled.
1 x Coil, Induction No. 27.
1 x Condenser, M.C. No. 97.
1 x Cord, Instrument No. 5/28E, 5" (for Dials, Auto., only).
1 x Dial, Automatic S.S., No. 10 ... or Dummy, No.3 (Colour).
1 x Part No. 3/SCA/17 (Colour)
1 x Telephone No. 164 (Colour)
1 x Tray, D 62076 (Colour) or D1/62833 (Colour) or 1 x Tray, dummy, D 62099, Black.

To be requisitioned separately as required:-
1 x Block, Terminal No. 20/ . . (Colour)
1 x Key No. 303A or 304A.
1 x Label No. 160.
1 x Label No. 252, Black.
1 x Part No. 1/SPL/325 .

Used as follows:-

Model	System Type	Dial Type	Colours
Telephone No. 328B	Brighton	BA	Black, Chinese Red; Ivory; Jade Green
Telephone No. 328CB	CB manual	Dummy, No. 3	Black, Chinese Red; Ivory; Jade Green
Telephone No. 328F	Non-director	FA	Black, Chinese Red; Ivory; Jade Green
Telephone No. 328L	Director	LA	Black, Chinese Red; Ivory; Jade Green
Telephone No. 328S	Siemens, Southampton	FS	Black, Chinese Red; Ivory; Jade Green

British Ericsson provided the GPO with Telephone No's 328F, 328L and 328CB.

Circuit diagram - N428.

Diagram for Button labels - N620.

Drawing No. 63022 - Telephone components parts.
Drawing No. 63023 - Chassis components.
Drawing No. 63250 - Chassis components (improved switch hook buttons).
Drawing No. 90373 - Chassis components (improved switch hook buttons).
Drawing No. SBA12 - 300 type base plate.
Drawing No. SCA17 - 300 type complete case.
Drwaing No. SCA20 - 300 type case.
Drawing No. SCA47 - 300 type complete case (improved switch hook buttons).