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Connecting the sense line to the +5vdc did/does work. In fact, this particular machine is part of a friend's collection now and I just saw it up and running this past weekend.
The voltage drop across the filter board shouldn't happen, but these parts are 30 years old now. Thinks are going to get worn out over time. My guess is the connectors on the filter board are not holding a good connection and that is the source of your power drop.