Ivan, the venue had a portable console that was only used for certain events, and was disconnected when not in use. The system was still used for DJ's and background music/paging, so it was active at all times.
There was no way to mute the inputs. The rack was in an upstairs area that was inaccessible to the employees, and this was pre-digital era. We floated the ground on the output side and tied on the input side (at the rack) and the problem went away. Soundcraft board, Rane analog rack gear, the old days......
I'm just grateful that a lot of the challenges we faced "in the day" are no longer an issue. I do kinda miss the look of awe on client's faces when you could walk in, clip one or two shields on a couple of cables, and make the "noise" vanish, although (in my life as an onsite service guy) I still find problems created by the previous "installer" that can be fixed this easily.
Add to that all the gear that had pin 1 problems and you would spend most of the time setting up for a gig trying to get rid of noise.
I keep reading about 'pin 1 problems' in old equipment. What does that refer to?Steve.
Maybe you don't have google where you live?
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