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).
Additional good quality pictures
How to wire your Telephone No. 328
to make it work on Plug and Socket
Dismantling your Telephone No.
328
Dismantling the Handset
History, Technical and General
Information on 300 type telephones
Collectors information
Adjustment of Magneto bells
Keys for use in 300 type wall and table
telephones
Lamp Fittings
Labels that fit in the sliding tray
General fault finding on your phone
How to restore Bakelite
Comparison chart of GPO 300 type
telephones

Typical 300 type chassis showing dial cord wiring arrangement
Pictures


Chassis fitted with a key unit

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