It has a weird buzz like a blown speaker but it isn't the speakers
The mixer is broken and a couple other items but that's not my issue..... my issue is as of now an hour ago i turned it on and it started buzzing and i know it's not my speakers because i switched them out for new ones to make sure and the same name came through. It is 40 yrs. old but it hasn’t had any major issues through it’s lifetime. Help!