Hi Guys,
I have a 2 channel H amp that has an annoying hum/buzz with nothing plugged in and the volumes all the way down. If you move your hand around the "handle" on the top of the amp it will buzz a lot worse. If you touch the metal screws in the handle even more buzz.
I took the chassis out and found the source of the buzz is the single un-shielded lead coming from the "RETURN LEVEL" pot to the 12DW& tube. It is extremely sensitive there and will hum/buzz like the dickens if your finger is anywhere close.
If you turn the "RETURN LEVEL" pot all the way clockwise the buzz will mostly go away... in their "sweet spot" of 2 o'clock it is pretty bad.
I took an alligator clip (Clip Lead) and clipped one end to the chassis and the other end just onto the insulation of the wire in question and the buzz was drastically reduced.
I then replaced the wire with a shielded one and the buzz is much better, got ground from the 1/4 jacks right next to the pot.
The buzz was better but not perfect so I clipped the clip lead in again, and again just over the insulation... It's like it's sucking RF off the outer parts of the insulated wire...
Does anyone know if this is a good way to solve this buzz problem? Anyone else already tried this?
I'm working on the classic "Crosstalk issues" as well. Any thoughts on that?
I have a 2 channel H amp that has an annoying hum/buzz with nothing plugged in and the volumes all the way down. If you move your hand around the "handle" on the top of the amp it will buzz a lot worse. If you touch the metal screws in the handle even more buzz.
I took the chassis out and found the source of the buzz is the single un-shielded lead coming from the "RETURN LEVEL" pot to the 12DW& tube. It is extremely sensitive there and will hum/buzz like the dickens if your finger is anywhere close.
If you turn the "RETURN LEVEL" pot all the way clockwise the buzz will mostly go away... in their "sweet spot" of 2 o'clock it is pretty bad.
I took an alligator clip (Clip Lead) and clipped one end to the chassis and the other end just onto the insulation of the wire in question and the buzz was drastically reduced.
I then replaced the wire with a shielded one and the buzz is much better, got ground from the 1/4 jacks right next to the pot.
The buzz was better but not perfect so I clipped the clip lead in again, and again just over the insulation... It's like it's sucking RF off the outer parts of the insulated wire...
Does anyone know if this is a good way to solve this buzz problem? Anyone else already tried this?
I'm working on the classic "Crosstalk issues" as well. Any thoughts on that?
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