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| Silly tread |
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| Circlotron:
--- Quote from: floobydust on November 25, 2018, 06:58:47 pm ---I don't know of any ground-loop between a guitar and amplifier- it's one cable :-DD --- End quote --- +1 |
| tpowell1830:
--- 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 --- As noted several times above, the devil is in the details, so all of the information above might be helpful. I also wonder of he has checked all of his connections inside the guitar to see if all of the pickups have intact wiring. This is just speculation, but it seems to me that 1 Khz is not a frequency that would emanate from a data center. I realize this could be a harmonic, as well. What else in or near the room could be leaking at this frequency? Also, again speculation, but it seems that if one side of a coil in a pickup is loose, it could be an antenna? But, again, without all of the details, we are all having a speculation party. With all of the information requested revealed, it will still be speculation, but maybe there are known devices, i.e. pedals, amplifiers that have known issues. EDIT: Wait a minute, he is in a basement, could this simply be feedback (positive) from the amp to the guitar? Does it stop when he covers the strings with his hand? |
| ebastler:
--- Quote from: 001 on November 25, 2018, 10:27:29 pm ---Do anybody has experience with server EMC? --- End quote --- Yeah, sure, the solution will be to quench the emissions from all those servers in the data center upstairs. Fat chance... You have not told us much about any systematic troubleshooting you might have done. (Unless I have overlooked it.) Can you even be sure that the problem is in the guitar? Is the same noise also audible with a battery-operated headphone amp, connected to the guitar with a short, shielded cable? What happens if you use the main amp and standard cable, but use a termination resistor in place of the guitar? Etc. |
| 001:
--- Quote from: ebastler on November 26, 2018, 05:43:47 am ---- --- End quote --- it is simple to recive this scream without guitar 1M open input is sufficient for this We try few amps -- tube peavey 5150, tube fender junior and some solidstate fender All of them squeal about 1kHz so it is some outer problem But what is cause for? Servers? Luminiscent lamps? wi fi routers? Big cooling chillers? What computer or power gear use audible frequencies now? PS -- I see railroad at about 200 yards :palm: Is it use some high power tonal signals in a rails? :-// |
| Simon:
I used to use a discrete sound card because on motherboard audio was shit as it picked up no end of crap. The motherboard in my new computer has a metal can over the audio chip...... 15 years later they finally got there. |
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