Evening all
So I set up at rehearsal tonight with my trusty ABM 300 Evo II and, while the amp worked, for the first few minutes I would get short, quiet bursts of a sound almost like very high pitched feedback, which also maxed out the VU meter reading. It stopped soon enough and didn't return, but I'm wondeirng if anyone has any ideas what may have caused this? I should add the amp has worked faultlessly every other time I've used it.
Cheers
Gareth