Elliott 803B British Germanium Transistor Computer circuit board
Scratched into board next to metal plate
On circuit side
On metal plate on circuit side
On component side
overall: 5/8 in x 17 in x 10 3/4 in
This is a TD142A unit. The section at the top generated synchronizing triggers from the biphase alpha & beta clock pulses and these triggers were applied to the ferrite core logic elements [brown & brown/white wires]. The logic elements are white. The small silver cylinders are obsolete germanium transistors (small signal). The large oval silver objects are OC23 germanium power transistors. Ferrite cores had inputs connected to stimulate or inhibit the trigger pulse. It was a form of alternating current pulse logic.