General > General Technical Chat
Home recording studio - noise with guitar amps - who to call?
<< < (6/12) > >>
DaveNJ:
I haven’t. So, are you suggesting that I connect a separate wire from the shield of the guitar cable to the ground pin of the amps power plug?
ebastler:
I would go from a metal part on the guitar (the pickup cover, knobs or such -- you had shown them all to be connected) to an exposed metal part of the amp, e.g. the nut of the 1/4" jack on the amp.

This is essentially to double-check that the two 1/4" jacks, two plugs and the cord inbetween do actually provide a ground connection. You could also measure continuity between the two mentioned metal parts with your multimeter.
DaveNJ:
OK, I just ran a piece of 12 gauge wire from the input jack nut to the guitar (try the strings, volume pot, control plate) and there was no difference.
ebastler:
Hmm, then maybe the blanket was shielding the guitar in your video -- but the shielding only works when the blanket is grounded, by making contact with one of the grounded metal parts on the guitar?

You could check that by putting the blanket underneath the guitar with the blanket's non-conducting side facing up; it should have no effect then. But if you connect the ground wire from the amp to the blanket's conductive side, it should shield the noise (if this theory is correct).

Not sure what the conclusion would be if you can confirm this. Probably some strong electrical fields coming in from outside; but what would you do about them?

One more thought: Do you have a battery-operated amp handy, or can you borrow one? If the noise also shows up with a humbucker guitar and the battery-operated amp, you would have confirmed that it is not coming in via the mains but via radiated immissions.
DaveNJ:
Yes! We actually did try that (blanket underneath but conductive side down)and it didn’t do anything.

I do have a battery powered amp, but I have to go get some batteries :-)
Navigation
Message Index
Next page
Previous page
There was an error while thanking
Thanking...

Go to full version
Powered by SMFPacks Advanced Attachments Uploader Mod