A projectionist's notes on carbon-arc hum, splice pops and the small rituals that keep a repertory print alive.
The booth is a narrow room with a carbon-arc lamp, a platter system older than most of the audience, and a small fan that never quite wins. On Friday afternoon the print arrives in three reels, and the second one carries a splice near the start of the second act. You can see it before you hear it: a small rectangle of tape, slightly darker than the rest of the frame line.
Threading takes about twenty minutes when nothing goes wrong. The gate tension has to sit somewhere between loose enough to protect the perforations and tight enough that the image does not breathe. I set it by feel now, but the first year I kept a note on the wall next to the cue-tape marks, and I still glance at it before the first show.
What people rarely mention is the hum. It sits under dialogue for the whole running time, low and steady, and after a while you stop hearing it as noise and start hearing it as the room. When the platter motor changes speed during a quiet scene, the hum shifts a semitone, and that is usually the first sign that something is drifting.
The splice pop is different. It is sharp, brief, and it lands right when the tape crosses the gate. Regulars know it. On Saturday night a woman in the third row looked up at the booth for a second, then went back to the film. That is the whole relationship in one gesture.
A warped reel announces itself about two minutes before anything looks wrong. The image starts to weave slightly at the edges, the focus drifts, and you have a short window to decide whether to ride it out or stop the show. We rode it out. The pacing of the quiet dialogue scene changed, and honestly, it worked.
Sunday's print arrived with a missing reel and no replacement. We ran what we had, told the audience at the door, and refunded the difference. Nobody shouted. A festival volunteer asked me afterwards why the room stayed through the credits anyway. I did not have a clean answer. The hum was still going, and I think that was part of it.