gec.gif (1164 bytes)GEC GECOPHONE
CIRCUIT DIAGRAM


Presented here are numerous wiring diagrams.  As many of these telephones have no part number on the base and no diagram pasted inside, you have to make up your mind which one relates to your telephone.  Under each diagram are instructions on how to wire the telephone up for the UK Plug and Socket system.

These are all pyramid style Gecophones.


Telephone to Diagram S52597

This telephones has two capacitors (in the same casing) an induction coil and bell on the base plate.  The body of the phone has a 6 way terminal block.

Using a standard UK line cord connect:

  1. Remove and discard the old line cord.

  2. Feed the new line cord through the casing entry hole and tie it or knot it to the metal loop inside the phone.

  3. White wire of new line cord to terminal 4.

  4. A 3.3k resistor fitted between 4 & 5.

  5. Red wire of new line cord to terminal 6.

  6. Green wire of new line cord - spare - insulate.

  7. Disconnect the green wire on 2uf capacitor and connect this to the Blue wire of the new line cord (insulate with tape).

  8. Check transmission and replace transmitter if bad and always fit a Rectifier element across the receiver on terminals 1 & 2.  Click here for more information.

 

The picture below shows the base of a Gecophone to diagram S52597
The induction coil is shown at the top and the double capacitor at the bottom


Telephone to Diagram KS8197

This telephone has a single capacitor, a bell or buzzer and a 4 way terminal block mounted on the base plate.  The body of the phone has a 6 way terminal block and induction coil.

Using a standard BT line cord connect:

  1. Remove and discard the old line cord.

  2. Feed the new line cord through the casing entry hole and tie it or knot it to the metal loop inside the phone.

  3. White wire of line cord to Bellset terminal L1.

  4. A 3.3k resistor fitted between Bellset terminals L1 and E.

  5. Red wire of line cord to Bellset terminal L2.

  6. Blue wire of line cord to Bellset terminal C.

  7. Green wire of line cord - spare - insulate.

  8. Disconnect one of the wires on the 2uf capacitor.

  9. Check transmission and replace transmitter if bad and always fit a Rectifier element across the receiver on terminals 6 & 5.  Click here for more information.


Telephone to Diagram of unknown number

This telephones has two capacitors (in the same casing), a 6 way terminal block and bell on the base plate.  The body of the phone has a 8 way terminal block and induction coil.

Using a standard BT line cord connect:

  1. Remove and discard the old line cord.

  2. Feed the new line cord through the casing entry hole and tie it or knot it to the metal loop inside the phone.

  3. Remove wire strap between Bellset terminals 5 and 6

  4. White wire of line cord to Bellset terminal 6.

  5. A 3.3k resistor fitted between Bellset terminals 5 and 6.

  6. Red wire of line cord to terminal Bellset 4.

  7. Blue wire of line cord to terminal Bellset 3.

  8. Green wire of line cord - spare - insulate.

  9. Disconnect one of the wires on the 2uf capacitor - the green wire and insulate.

  10. Check transmission and replace transmitter if bad and always fit a Rectifier element across the receiver on terminals 1 & 2.  Click here for more information.

This is a 1936 Gecophone made for Telephone Rentals


Telephone to Diagram KS7239

This telephone has a single capacitor, a bell and a 4 way terminal block mounted on the base plate.  The body of the phone has a 6 way terminal block and induction coil.  The terminals are labelled with letters and numbers

Using a standard BT line cord connect:

  1. Remove and discard the old line cord.

  2. Feed the new line cord through the casing entry hole and tie it or knot it to the metal loop inside the phone.

  3. White wire of line cord to Bellset terminal L1.

  4. A 3.3k resistor fitted between Bellset terminals L1 and E.

  5. Red wire of line cord to Bellset terminal L2.

  6. Blue wire of line cord to Bellset terminal C.

  7. Green wire of line cord - spare - insulate.

  8. Disconnect one of the wires on the 2uf capacitor.

  9. Check transmission and replace transmitter if bad and always fit a Rectifier element across the receiver on terminals 2 & 3.  Click here for more information.


This telephone has an 8 way terminal block in the phone body and a 4 way terminal block on the base plate.

In the picture above, which is a converted Gecophone, the green of the line cord looks like it is terminated on E, when in fact it is not terminated and is insulated.  Note that there is only one wire terminated on the capacitor - the other wire is hanging free and should be insulated.

Using a standard BT line cord connect:

  1. Remove and discard the old line cord.

  2. Feed the new line cord through the casing entry hole and tie it or knot it to the metal loop inside the phone.

  3. Remove wire strap between Bellset terminals L1 and E

  4. White wire of line cord to Bellset terminal L1.

  5. A 3.3k resistor fitted between Bellset terminals L1 and E.

  6. Red wire of line cord to terminal Bellset L2.

  7. Blue wire of line cord to terminal Bellset C.

  8. Green wire of line cord - spare - insulate.

  9. Disconnect one of the wires on the 2uf capacitor and insulate.

  10. Check transmission and replace transmitter if bad and always fit a Rectifier element across the receiver on terminals 1 & 2.  Click here for more information.

 

 
 
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Last revised: April 05, 2021

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