Resistors Good or bad?

[jsarsfield]

Hi I'm in the process of rebuilding a Peavey guitar amp head and there are a few 3.3ohm 5watt 10% ceramic resistors and I'm getting an Ohm reading of 1.7 on all of them ... Now my question is are they close enough within tolerances or should I replace them? I can't see all of them having the same reading if they were shot thanks for any input

 

[xwarp]

+ or - 10% on 3.3 gives you a range of 2.97 to 3.66 ohms.

sounds like you need to lift a leg on each and test them again. if you are still out of that range, then yes, replace them.

 

[yzracer14]

you usually can't get an accurate reading when a component is still attached to the board compeltely. You don't know what else in the chain is affecting your reading. As the user above me suggested, lift a leg and check it again.

 

[johnnm]

They are out of tolerance, yes. Do you need to replace them? Not necessarily, but I would just to be safe.

 

[jsarsfield]

I'm going to test them with one leg pulled up as yzracer suggested first it just struck me funny that they are all reading the same 1.7ohms

 

[johnnm]

Some older resistors can permenantly change value due to thermal stress and/or moisture in the air over time.