Shielded Cable question

[rutledj]

Why does moving shielded cable around affect the amount of noise in the amp? I thought the whole reason for the shield was to "protect" it from this.

Rut

[HiGain]

Interesting question. A lot of cable uses braided shield, which does not create 100% protection; probably more like 80%.

The Gepco stuff I have uses a solid foil as the shield, but I have not determined whether moving the cable alters the noise level.

There are probably more answers, but I'm not the one to know.

Jake

[roadkingbluzs]

Do you have any kind of flourescent fixtures or ballast that share the circuit your plugged into. Case in point, the bass amp picks up noise signal from low voltage lighting in next room. Lights out noise gone! Go figure! Probably grounding issues?

[Dai H.]

do you mean hum? Shielded cable won't provide hum protection because copper won't block those low frequencies.

[HiGain]

I just moved around my overdrive and master shielded cables and it seemed to affect the overall tone very slightly, mainly the highs, but also the (crucial) mids.

I'm sure it depends on what components and circcuit nodes the wires run near.

An interesting test would be to place a 1 MEG pot in series with the cable shield to ground. That, or try different value caps. This could be an interesting place to do some final tuning, for those crazy enough to go to that level

Jake

[Funkalicousgroove]

Check your solder joints.