This is the standard British Post Office Telephone Set. It is a self-contained microtelephone set with ringer housed in the case. Supplied complete with cords and moulded terminal block.
The microtelephone incorporates the high quality receiver giving a gain of intelligibility equivalent to about 5db.
The set is constructed of moulded bakelite and the standard colour is black.
An anti-side tone circuit is used so that extraneous noises in the vicinity of the listener cause minimum interference with the reception of speech.
Unless otherwise ordered Dial No. 4002-AG, showing numbers only on the number plate, will be supplied with these sets. Number plates with any other type of marking can be supplied if a sample or drawing is submitted.
The No. 4509-A set is similar but the dial is replaced by an apparatus blank. fitted at a later date if required.
|4509-A||Manual||6" (5.24cm)||7.75" (19.68cm)||6" (5.24cm)||5lb 9oz|
|4509-B||Auto||6" (5.24cm)||7.75" (19.68cm)||6" (5.24cm)||5lb 13oz|
|4509-C||Manual||6" (5.24cm)||7.75" (19.68cm)||6" (5.24cm)||5lb 3oz|
|4509-D||Auto||6" (5.24cm)||7.75" (19.68cm)||6" (5.24cm)||5lb 7oz|
|4509-J||Auto||6" (5.24cm)||7.75" (19.68cm)||6" (5.24cm)||5lb 7oz|
4509-A and B Sets are fitted with a Directory Tray.
4509-C, D and J Sets do not include a Directory Tray.
STC Apparatus Catalogue for Telephone, Remote Control and Railway Signalling Catalogue, Edition 5 (1952)
These have also been seen with LP14226 & LP14230 (4509BG) markings
See also British Ericsson Telephone No. N1005A
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Last revised: October 27, 2004