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Sorry Timbre, it appears that the noise is back. It isn't humming but it is making short, repetitive popping noises that seem to come in sequence. This is coming through both channels and is not affected by the volume controls on the power amp.

Ok. I changed the tube that was glowing blue with a brand new one. When I turned it on and hit stand by the new tube was now glowing blue! The sound was also still eminating from the speakers. So I tried changing all the 12ax7 one at a time and found that replacing the far left tube the noise...

Hi, About a week ago my power amp started acting strange, emitting odd pops and crackles and an overpowering hum. When I checked the tubes, one appeared to be glowing blue/purple. I have a spare tube but don't know the procedure for replacing power tubes. I can't seem to remove the faulty tube...

Don't worry too much, theres probably nothing wrong with your unit other than that melted connector. I had the same problem three months ago, as i'm sure many 2:90 owners have in the past. It's a production fault. In order for Mesa Boogie to manufacture a great deal of units they must...

Ok, so I tried the poweramp again, now it works! When I switched it off standby my signal was coming through normally. I played for about ten minutes, then the amp started to smell, sort of like the smell after you pop a christmas bonbon. I totally assume this is bad, and im not sure if its a...

hi guys, this is my first thread here and I need help! I bought a second hand Simul 2:90 about 6 months ago, i haven't changed the tubes and as far as I am aware the previous owner hadn't changed them in over a year. Today I turned it on and left it on standby for five minutes. When i flicked...