Weird noise with 2006 SEX [resolved]

[pendergast]

Hi,

I am the (very-very) happy and proud owner of a SEX purchased as a kit here in 2006.

I am sad tough because when I turn the volume up there is a sound like an "electric scratch" coming through the right side, both using headphones or the speakers. The noise does not change in intensity as I turn the knob.

A visual inspection shows no disconnect or bad soldering (though I have not touched it since the iron upgrade from 2007 or 2008).

Now, would I be right to suspect that the issues is with the dual 100 k potentiometer? Or could there be another issue?

Thank you in advance for your help!

[johnsonad]

You may want to try swapping the tubes and see if the sound changes to the other channel.

[pendergast]

No change. Actually, it seems that the noise isn emitted through both channels, and only when I turn the knob. I guess the pot is dead.

[johnsonad]

With the amp off you may want to try rapidly turning the knob in question back and forth to both ends. Somethings those carbon pots need a little cleaning to quiet down.

[pendergast]

Where is the Nobel prize for simple solutions?  You deserve it!

The Joy of SEX is back!

Thank you!

[johnsonad]

It's an old trick with carbon pots. Do it every few months to keep the contacts fresh. Enjoy!