PDP-8 (Straight 8) Functional Restoration Bad Diode Curves
This shows the curves of the bad diodes from the R220 compared to a good diode. D18 caused the R220 TTO enable output to not function correctly (see next picture). D43 I replaced when measurement with my DVM showed .4V forward drop vs .6 of the other diodes. D18 is leaky at higher reverse voltages. D43 is much worse.
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