This might be a common problem, but in my 45 years of playing plugged in, I've never heard this before.
My Blues Jr has developed a 'whistle'. Some might call it a squeal, and if you turn it up loud enough I'd be inclined to agree, but I'm call ing it a whistle for now.
It does it without anything being plugged in, but if you plug something in it's worse. If you turn the master down to about 1 1/2-2, and then turn the volume, the whistle starts and gets louder. Logical.
If you set the volume at about 6 (of 12), all 3 tone controls to 6, reverb to 0, you'll get the whistle. As you turn the Treble up, the pitch will rise. Turn it down, it will lower in pitch and volume until you can hardly hear it. If you turn the bass all the way up, you'll get low feedback.
I'm assuming it is in the preamp stage, but does this sound like a tube going bad?
My Blues Jr has developed a 'whistle'. Some might call it a squeal, and if you turn it up loud enough I'd be inclined to agree, but I'm call ing it a whistle for now.
It does it without anything being plugged in, but if you plug something in it's worse. If you turn the master down to about 1 1/2-2, and then turn the volume, the whistle starts and gets louder. Logical.
If you set the volume at about 6 (of 12), all 3 tone controls to 6, reverb to 0, you'll get the whistle. As you turn the Treble up, the pitch will rise. Turn it down, it will lower in pitch and volume until you can hardly hear it. If you turn the bass all the way up, you'll get low feedback.
I'm assuming it is in the preamp stage, but does this sound like a tube going bad?
