Noisy (bad) tube or tubes.
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It could be any of the above. I'd check your interconnects and make sure you are properly grounded. You can even open things up and look for a loose contact. If that does not help then eliminate items by substituting things.
For example wire your power amp in reverse (left to right speaker and right to left speaker) and see if it moves to the left speaker. If it does not then you can eliminate your power amp as the problem.
When I put a line conditioner in my system, the crackling noise stopped. A multimeter line check showed that the voltage was going from 118 to 140 volts within seconds that summer.
The Tripp lite line conditioner LC1200 solved this problem relatively inexpensively. This is definitely not audiophile-grade equipment, but in this case it worked without having to deal with tube diagnosis issues.
Thanks for the quick help here. I currently am using a power conditioner, so will try the tube rotation idea first and then look at other connection issues. Is it possible to be an issue with a power cable? That is the last new cable that has been added in the system. I am not sure when I first noticed the crackling/fuzz, but who knows sometimes.
Before you do anything else: Next time you hear the crackle, tap each of the tubes in that channel with the eraser end of a pencil. It the sound gets worse, or disappears- you've found your culprit. Start with the driver/phase splitter tubes, as those usually generate that type of sound when faulty.