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Silly tread
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Benta:
OK, so it's not the pickups (you say).
Second entry point is the loudspeaker leads. High frequency signals can enter at this point and be "demodulated" in the amplifier stages.
A first attempt is passing one of the loudspeaker cables through a ferrite ring very close to the amplifier output.
001:

--- Quote from: Benta on November 25, 2018, 10:42:40 pm ---OK, so it's not the pickups (you say).
Second entry point is the loudspeaker leads. High frequency signals can enter at this point and be "demodulated" in the amplifier stages.
A first attempt is passing one of the loudspeaker cables through a ferrite ring very close to the amplifier output.

--- End quote ---

Honey, any RF are killed by output transformer LC it is more complex problem than oldtime AM-radio in the guitar
I loose my mind now  |O
Benta:

--- Quote from: 001 on November 25, 2018, 10:47:10 pm ---
--- Quote from: Benta on November 25, 2018, 10:42:40 pm ---OK, so it's not the pickups (you say).
Second entry point is the loudspeaker leads. High frequency signals can enter at this point and be "demodulated" in the amplifier stages.
A first attempt is passing one of the loudspeaker cables through a ferrite ring very close to the amplifier output.

--- End quote ---

Honey, any RF are killed by output transformer LC it is more complex problem than oldtime AM-radio in the guitar
I loose my mind now  |O

--- End quote ---

"Honey"? I'm male with a full beard. But you're on my "no-go" list now.

As you haven't mentioned in one word which amplifier it is, it's no wonder that you get answers that you can't use. Clueless question = Diffuse answer.

Just change the cable to avoid ground loops...

Jeez!
Bassman59:

--- Quote from: 001 on November 25, 2018, 02:28:16 pm ---Hi

My sons friend has marvelous problem with his electric guitar
It is some "computer"  whistling and audible "noise" at about 1kHz in the amplifier. And he says what he play at datacenter basement  :palm:
How to eliminate EM problem?

--- End quote ---

It really helps to know:

a) What guitar he's playing, including type of pickups,
b) What kind of effects pedals he's using, if any,
c) What kind of amplifier he's using.

Some older ("vintage") amps are notorious for picking up noise, and since sometimes the mechanism for this noise pickup is endemic to the design and construction of the amp, you're stuck -- replace the amp with something more modern. Check to see if the amp is properly grounded. Sometimes the idiot guitars will cut off the third-wire ground pin on the power cord in a desperate attempt to make noise go away, and that's never good. A high-gain amp setting will also make noise worse.

Some guitar pickup configurations are susceptible to noise. These are usually single-coil types (like you find in stock Fender Stratocasters and Telecasters), but some poorly-wired guitars with humbuckers are noisy, too. Sometimes just changing where you stand in the room improves things. Check to see that the strings on the instrument are grounded, and that the cavity with the electronics is shielded.

Pedals with high gain, such as fuzz/distortion boxes and compressors, just exacerbate existing noise problems or are actually the problems themselves. The MXR DynaComp sounded pretty cool but damn it made a mess of things.

I seriously doubt noise is getting into the amp via the speaker leads.
Buriedcode:
Yeah I think we need much more info.  Also it *sounds* like you're assuming there is a fault somewhere, where-as it seems to me - given that you said he plays in a "data centre" that its simply picking up radiated noise - which is what guitar pickups do really well!

1) Is the noise present when the guitar and amp are far away from electrical equipment?
2) Is he playing clean, or high gain?  As stated, by myself and another poster - high gain will always pick up some noise, either from the amp itself, or cell phones, cars starting .. people underestimate how much gain modern amps and pedals have to satisfy the bedroom-volume playing folk.
3) What guitar is this?  Even strats (single coils) have a phase cancellation on their selector switch which can dampen or at least reduce by half, any noise.

edit: just realised bassman pretty much asked the same stuff.... well I guess I'll just second them!
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