Hey all! I just got a used Ibanez Promethean P5110 combo in the mail today and when I play through it, I get a distinguished amount of distortion that is audible at all volume levels, although the distortion itself does not get any more harsh or soft. It is not a battery in the bass problem, it is not a speaker problem, it is not a cable problem, I have tested all of these. The problem is coming directly from the head. It has the same distortion with any bass, any cable on any speaker. After a small amount of research, I'm hypothesizing that it's a faulty component in the amp causing the output stage to be underbiased. I haven't opened the amp up yet and I'm asking if anyone has had any similar problems and if they have any good solutions. Thanks and best regards!