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Discussion in 'Amp Tech Center' started by RICKYV, Aug 29, 2015.
Overly distorted, sounds like an octave pedal is on!
Start with tube swappin', power first.
Yup. Then check your speaker.
I did, it's neither.
Get a Rat pedal for distortion, leave the amp's settings on clean.
How do you have the amp set? I am assuming you have it dialed for a clean tone, but are getting distortion meaning the amp is malfunctioning? Did you also swap the preamp tubes?
A user on billm's site reported octave like distortion that wasn't fixed by replacing tubes. Here is billm's response: link.
Phase inverter oscillation is more common on creamboard amps. So filter caps and/or solder joints would be my guess. Check out the comments on these 2 threads to see if anything sounds like the problems you are having:
If the relatively simple diagnostics of tubes and speaker don't solve it, then I, too, think to consider bad filter cap(s).
Properly functioning Blues Junior should be capable of relatively clean all the way up to MV full and volume around 11 or noon and your guitar vol not on full blast. You should start hearing preamp distortion taking the amp's Vol knob up past that point. If it is distorting all up and down the Vol range, then something is wrong with the power. Bad filter caps or cracked solder joints.