AVS Addicted Member
Join Date: May 2000
Location: Vancouver, Canada
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Frankly, I would wait. Dragan could be right, but you may also have had an internal arc in a tube, which is harmless. It happens from time to time due to internal tube impurities.
I do have anode leads in stock that are new, and if you're going to tear the set apart, I'd do all three, as they are cheap, and they do all age similarly. If it does it one more time at all, then do change the leads, but if not, I think you're fine.
An external arc as Dragan is guessing can indeed damage boards, so do jump on it if you hear it again, but a failing HV lead usually will arc/spark fairly repetitively as the insulation breaks down. Email me through the site below if you do need HV leads.