Noisy F-1X

[hudsobass]

Any thoughts on the noise level of my F-1X.  When the bright switch is engaged, it is especially noisy.  Even without the bright switch engaged, it is noisier than it should be.  The tube has never been replaced.  Should I check ithe tube?  In a recent live performance I opted not to use the XLR out to the mains because the noise would have been transfered to the mains.  I opted for a direct box instead.  I would prefer to get the noise level down and continue to use the XLR out.  Thoughts?

[gtrguy]

You might try cleaning the jack contact switch inside the back with very fine folded bit of sandpaper, try another tube, and try cleaning the jacks from the outside with a 9mm pistol cleaning brass brush with a little alcohol (not the kind you drink) on it. I also try inputting my bass at the effects loop return instead of the front jack and see if it's more quit that way when recording.