AEI CENTENARY NEOPHONE
There was also a Kingston Communications variant called the model 904 (non-regulated and regulated) and 908 (non-regulated type).
Models 980 and 981 were the wall mounted variants.
There is normally a circuit diagram in each phone - look under the printed wiring board.
Picture of internals with case removed
The above picture shows a Type A telephone. The type A differs from the type B in so much as it does not have the short line attentuation resistors and also has two terminals missing.
The missing terminals are 1 and 3 and there is a hole in the circuit board where each terminal should be. See picture above - lower left hand side. Even though these terminals are missing, the rest of the terminals are numbered as if the missing terminals are still there.
The wall version of the Centenary Neophone - Model 980/981
Last revised: June 06, 2020