PDP-8/L Restoration


We pulled the G785 module out of the backplane. This disconnects the power supply from the backplane. We connected a Variac between the AC power source and the 8/L and slowly, over the course of hours, increased the AC voltage to the 8/L power supply. The voltages looked OK, so we put the G785 back in the backplane and powered it on at full AC voltage. After a few minutes smoke poured from the rear transformer in the power supply. Another 8/L own