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GPO Telephone 700
General information - this page is a stub

...

GPO Telephones 746L (left) and 740 (right)

700-series equipment on this website
GPO Telephone No. 740
740
GPO Telephone No. 746
746
Models
Below is a non-exhaustive overview of the various models in the GPO 700-series. For a more complete overview with photographs and detailed descriptions of each model, please refer to Bob Freshwater's excellent website [1].

  • 700
    Tabletop telephone with 700-circuit in 300-case (field trial)
  • 702
    Tabletop flame-proof version with intrinsically safe handset
  • 703
    Wallmount version of 702
  • 704A
    Lineman's telephone with green plastic case
  • 706/1
    Standard tabletop telephone with dial and conventional wiring
    (ivory, black, topaz, yellow, blue, grey, green, red)
  • 706/2
    Printed Circuit Board (PCB) instead of conventional wiring
  • 706/2A
    Same as 706/2 with with extra supports for PCB and knock-outs removed
  • 706R
    Same as 706, but with RECALL button (grey)
  • 1/706
    Temporary designator for 711 during field trial
  • 708
    Tabletop model with Lst No. 1 (grey)

  • 710
    Same as 706, but with provision for 4 buttons and 2 lamps
  • 711
    Wallmount version of 706
  • 712
    Temporary designator for 722 during field trial
  • 712/2
    Temporary designator for 722 during field trial
  • 713
    Pendant telephone (vertical handset) (grey)
  • 714
    Push-button Trimphone (never taken in production)
  • 716
    Tabletop model with Lst No. 1A
  • 718
    Tabletop model woth Amplifier No. 1450 and Control Unit No. 11A (grey)
  • 722
    Trimphone (grey, blue, green)
  • 1/722
    Trimphone (grey, blue, green)
  • 1/722L
    Trimphone (grey, blue, green)
  • 2/722A
    Trimphone with Dial No. 53 (field trial) (grey, blue, green)
  • 2/722F
    Trimphone with Tone Ringer No. 8A (grey, blue, green)
  • 723
    Flameproof version with intrinsically safe handset (magneto)
  • 724L
    Same as 706, but with push-button VF signalling
  • 726F
    Same as 710, but with push-button DC signalling
  • 726L
    Same as 726, but with ENQUIRY button (letters and figures on buttons)
  • 1/726
    Same as 726, but with bell loudness control
  • 2/726F
    Same as 726F, but with Tele-Dictation push-button
  • 3/726F
    Same as 726F, but with bell loudness control
  • 4/726F
    Same as 726F, but with 6 push-buttons
  • 728L
    Modified 710 with push-button VF signalling
  • 730L
    Modified 710 with push-button loop-disconnect signalling
  • 732L
    Tabletop model for Push Button Telephone System No. 1
  • 735
    Payphone with dial and coin collection box
  • 736
    Same as 706, but with covert fitted to base by a single screw

  • 740
    Successor to 710 (black, grey, ivory)
  • 741/1
    Successor to wallmount 711 (metal base)
  • 741/2
    Successor to wallmount 711 (plastic base)
  • 745
    Weather resistant phone with dial (weatherphone) (blue, grey)
  • 745M
    Same as 745, but with metric conduit entry
  • 746F
    Successor to 706 (green, red, ivory, black, blue, yellow)
  • 746L
    Successor to 706 (green, red, ivory, black, blue, yellow)
  • 746R
    Same as 746F, but with RECALL button (grey)
  • 746S
    Used as standard in 746T field trial
  • 746SR
    Same as 746S, but with RECALL button
  • 746T
    Same as 746, but fitted with Telephone Unit D94244 (field trial)

  • 755
    Wallmount version of 746 with push-button pulse dialling
  • 756
    Tabletop version of 746 with push-button pulse dialling
Documentation
  1. N840, Telephone No. 740 circuit diagram
    GPO, 18 February 1969 - 12 Actober 1972. Issue A (1 page). 1

  2. N4700, Auxiliary Units and Additional Parts for 700-type Telephones
    GPO, 12 August 1963 - 15 May 1977. Issue C (4 pages). 1

  3. N848, Auxiliary units for Telephones, Nos. 710, 711, 740, 741 & 746
    GPO, 21 January 1969 - 9 May 1977. Issue J (4 pages). 1

  4. Press-Buttons for Tel. No. 710, 711, 740, 741 & 746
    GPO, 10 February 1969 - 28 July 1980. (2 pages). 1
  1. Document obtained via [1].

References
  1. Robert Freshwater, GPO/PO/BT Telephone list by number
    Bob's Telephone File (website). Retrieved August 2021.

  2. Robert Freshwater, Telephone No. 710
    Bob's Telephone File (website). Retrieved August 2021.

  3. Robert Freshwater, Telephone No. 740
    Bob's Telephone File (website). Retrieved August 2021.
Further information
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Crypto Museum. Created: Friday 06 August 2021. Last changed: Tuesday, 10 August 2021 - 11:17 CET.
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