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In Reply to: RE: Dumb question - how to tell valves are spent? posted by Neillo on November 28, 2007 at 10:54:41
As others have posted, the system over time just doesn't have the intensity it once had. I would recommend keeping a spare set of new or NOS tubes on hand, and when you become suspicious just plug in the new tubes. If the system comes back to life, its time to re-tube.
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