Factory Warranty Conditions WHITE SPARK PROBLEM
Some not so perfectly designed amplifiers can cause a power triode to spark. This is bright spark, blue or white, and it causes a very loud noise from the loudspeakers. If this happens, you may think it's a short circuit in the tubes, specially if it seems to be connected to one tube of the pair. However, this is always an amplifer problem. The effect gets larger when the tubes have better emission. So you may observe this with large power tubes, but it can happen to smaller tubes as well, when the switch-on effects in the amplifier are very bad. In this case, all kind of damage can happen to your tubes, speakers, or amplifiers. Do not use the tubes any more, and contact your amplifier manufacturer to have the amplifer fixed. For amplifier designers the below links may be
helpfull.
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