|
 Introduced in 1939 this is a combined
table handset telephone used by the BPO in both
C.B. and Automatic
exchange areas.
This telephone has a DC Trembler bell, with one bell gong
only and
provision in the
Bakelite case for three press buttons.
The bell was for intercommunication only and
would have rung on an incoming exchange call.
Detail as for Telephone No. 326,
Black, minus Cord, except the Cradle-switch action is 2 Make
and l Changeover, instead of 2 Make.
Used on extension plans that require an additional gravity
switch hook
springset.
Mark 1 - has a receiver, Inset No. 1L in the handset.
Mark 2 - has a receiver, Inset No. 2P in the handset.
Mark 2A - has a receiver, Inset No. 2P in the handset with a
switch hook bracket and
plungers of an improved design.
Early models may be found with a Filter, Suppression No. 6
and a Coil, Induction No. 22 fitted.
Spring 1 of the cradle switch is the spring-set adjacent to
the mounting.
Telephone includes:-
1 x Bell No. 65A, Unmounted.
1 x Part No. 3/SCA/17, Black.
1 x Bell-gong No.2, Nickelled.
1 x Capacitor, M.C. No. 97.
1 x Filter, Suppression No. 26A.
1 x Telephone No. 164, Black.
1 x Coil, Induction No. 27.
1 x Tray, D 62076, Black or Tray, D1/62833, Black or Tray,
Dummy, D62099, Black.
1 x Dial, Automatic, Dummy No.3, Black (on CB variant).
Diagram for telephone circuit - N406.
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. 90319 - Telephone
parts (Mk 3A).
Drawing No. 90373 - Chassis
components (improved switch hook buttons).
Drawing No. SBA12
- 300 type base plate.
Drawing No. 3/SCA17 - 300 type
complete case.
Drawing No. 3/SCA20 - 300 type
case.
Drawing No. 3/SCA47 - 300 type
complete case (improved switch hook buttons).
How to wire your Telephone No. 306
to make it work on Plug and Socket
300 Type
telephone circuit description
Dismantling the Telephone No. 306
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 connections
|