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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...

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...