TELEPHONE No. 330


Introduced in 1937, this combined Bakelite table handset telephone for use by the BPO in CB & Automatic areas on PBX extensions, systems that require recall facilities and certain 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.

It is designed with an ASTIC circuit and comes with a tray, for the subscribers personal directory.

The press button label would have been ordered separately (Label No. 252 Black).

Supplied with one press button.

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.

Suffix identification:-
Telephone No. 330CB - No dial - blank plate fitted.
Telephone No. 330L - Figured and lettered dial installed.
Telephone No. 330F - Figure only dial installed.

Telephone Includes (1946):-
1 x Bell No. 59A, Unmounted.
1 x Bell-gongs Nos. 2.
1 x Bell-gongs No. 2A Nickeled.
1 x Block, Terminal No. 20/4, (Colour).
1 x Coil, Induction, No. 27.
1 x Condenser, M.C. No. 97.
1 x Cords, Instrument No. 4/57B, (Colour), 54".
1 x Cords, Instrument No. 5/28E, 5" (for Dials, Auto., only).
1 x Dial, Automatic S.S., No. 10 ... or Dummy, No. 3 (Colour).
1 x Key No. 302A.
1 x Part No. 2/SCA/17 (Colour).
1 x Telephone No. 164 (Colour).
1 x Tray, D 62076 (Colour) or D 1/62S33 (Colour) or 1 x Tray-dummy, D 62099, Black.

Uses as follows:-

Model System Dial Colour
Telephone No. 330B Brighton BA Black, Chinese Red; Ivory; Jade Green
Telephone No. 330CB CB manual Dummy, No. 3 Black, Chinese Red; Ivory; Jade Green
Telephone No. 330F Non-director FA Black, Chinese Red; Ivory; Jade Green
Telephone No. 330L Director LA Black, Chinese Red; Ivory; Jade Green
Telephone No. 330S Siemens, Southampton FS Black, Chinese Red; Ivory; Jade Green

British Ericsson made some of these instruments for the BPO.
Click here to go to the Ericsson CB model No. N1366.
Click here to go to the Ericsson Automatic model No. N1003.

Diagram for telephone circuit - N430.

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. 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. 330 to make it work on UK Sockets

Dismantling the Telephone No. 330

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

 

 
 
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Last revised: July 27, 2022

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