I get a buzz noise from my Fender amp. If I turn the volume all the way up om my guitar it stops buzzing.
closed as unclear what you're asking by Carl Witthoft, Dom♦ Mar 21 '17 at 13:23
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I asked for a few clarifications, but I am going to go ahead and give some information about what I think the OP is asking about.
So the volume control is a potentiometer which is basically a variable resistor, which adjusts impedance to divide (reduce) the voltage.
When the volume is at zero, the output impedance is zero, and when the control is at 10, the impedance is basically the pickup impedance.
But when you turn the knob, impedance will rise appreciably to a maximum and then fall off again. On a normal pot, maximum will be at about 5, but on an "audio taper pot" it will be at about 8.
One can check the impedance of the circuit by connecting a multi-meter to the guitar cable (convenient) or the jack itself (less convenient) and then actuating the pot. That maximum measured impedance with a 250K volume pot is probably going to be in the neighborhood of 60-65 Kohms, but with a 1meg pot, it could be 250 Kohms.
Basically, higher impedance passes higher frequencies and this means a guitar with a 1Meg pot is "more sensitive" to hiss. So the OP probably has a high-value volume pot, which causes it to be more sensitive to noise, since it does not attenuate high frequencies as much as e.g. 250K pot.
Some of this unattenuated noise might be cold or loose solder joints, grounding issues, and even a mis-wired cable jack (check this if the noise is attenuated by touching the strings).
(Resistors do create their own noise (thermal noise) that is proportional to resistance value. It is unclear to me if this is a consideration in a guitar.)
It's worth re-soldering all joints (if you're competent to do this). Maybe replace the volume pot. Note that with volume fully up, the volume pot and any interference it is 'picking up' is effectively shorted out.