I posted a week ago that I bought a used Mesa Boogie Mini Rectifier. I quickly found that I liked the 25w setting on the red channel much better than the 10w. I live in a townhome so I have to be mindful of the neighbors. I quickly realized to play the amp at anything over the spot where sound begins to come in on the amp (7:05 on a clock) I needed an attenuator.
I hooked up a Hot Plate and put the volume on the amp up to about 11:00 and set the Hotplate at 12db. It was still loud but as long as I play early I should be fine. While I was practicing yesterday on the red channel, the power seemed to cut out and I heard a crackle sound.
I had probably 7-8 hours of playing without the attenuator on the volume at 7:05 and didn't have any problems. Yesterday about 30 minutes into playing it happened. I put the amp into standby and waited 10-15 min and it was still there (I saw on the mesa owners manual they suggested this). I shut the amp off and came back an hour later and it was fine.
Does this just sound like a bad power tube or is the attenuator somehow affecting the amp? THD's directions are not very comprehensive so I also want to double check I'm not doing something wrong.
Did it sort of fade out really aggressively? This sounds INCREDIBLY dumb, but make sure you have it hooked up correctly; your amp's output should run into the input of the Hot Plate, and the Output of the hot plate should run into the cab's Input. They get about a dozen calls a day with this problem; I know this because I was once one of them.