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resistor hum in passive i/v stage

post #1 of 4
Thread Starter 
I've got a valab dac and the resistor in the left channel has caused a "hum" in only that channel at high volumes. I replaced it with a cheap radioshack resistor as a test and the problem went away. My question is what happend to this resistor (it's a PRP 330 Ohm). I did not realize resistors could "go bad" like this? Did i overheat it? just a bad part? it's strange.
post #2 of 4
May not have been the resistor. May have been a dodgy solder joint that was resolved when the new resistor was installed.

se
post #3 of 4
From my (limited) experience, if they're damaged but not entirely destroyed their value has been permanently changed; it shouldn't fluctuate wildly. It was probably the joint.
post #4 of 4
Thread Starter 
but I took the radio shack one back out and put the old resistor back and the noise returned. I resoldered it a few times and still had the noise. Hmm i wonder if I need to solder-suck all the old solder from the back of the board and apply fresh solder.
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