[w62820616]

I noticed that my alps RK097 pot has a noise problem when I turn the shaft really fast. It only happen to the right channel ( where the metal shaft directly connected to). you need a low impedance ear phone to hear the problem (i am using UE ). But if you turn the pot really slow, you will not hear the noise. Anyone else have the problem? The pot is star grounded to the output jack.

 

[liamstrain]

It could be some build-up on the resistant coating. I would hit the pot with some contact cleaner and work it back a forth a few times (then hit it again, to flush out the muck). 

 

[Avro_Arrow]

It could also be an indication that it has some DC going through it.

 

[w62820616]

One directly connect to the input jack, one directly connect to the input cap, one directly connect to the ground. Do you think the cap is leaking? I am using WIMA 0.47uf

 

[Avro_Arrow]

It could be offset from your source.

 

[Avro_Arrow]

Does the sound change with the input shorted/open?

 

[tomb]

It sounds like DC symptoms.  I would also hesitate about squirting any contact cleaner into an Alps pot.  I'm not positive about the RK097, but the RK27 Alps' are lubricated around the shaft and the contact cleaner will dissolve all of it.

 

[liamstrain]

Quote:

It sounds like DC symptoms.  I would also hesitate about squirting any contact cleaner into an Alps pot.  I'm not positive about the RK097, but the RK27 Alps' are lubricated around the shaft and the contact cleaner will dissolve all of it.

I did not realize. This is my usual fix for a scratchy pot, but usually I'm working on a vintage piece - nothing with a new ALPs in it. Thanks for the heads up. 

 

[tomb]

Quote:

I did not realize. This is my usual fix for a scratchy pot, but usually I'm working on a vintage piece - nothing with a new ALPs in it. Thanks for the heads up. 

No problem.  Unfortunately, I found this out from experience ...

 ruined a perfectly good RK27 in the process.