Have you done anything to make sure the static is actually originating in the amp? If not, WITH AMP OFF, remove both interconnects and power it up again. If the static's still there, it's the amp; otherwise, look elsewhere.
If the amp is at fault, I'd suggest that you check the resistances of the power traces on the PC-3 board AFTER YOU UNPLUG THE AMP AND MAKE SURE THE HIGH VOLTAGE IS FULLY DISCHARGED. They should read close to the residual resistance of the meter leads, but I've seen some read about 60 ohms and guess what! They made crackling noises. If this is your problem, try reflowing solder over the traces AFTER YOU UNPLUG THE AMP AND MAKE SURE THE HIGH VOLTAGE IS FULLY DISCHARGED. Check for solder bridges before powering it back up.
Good luck.
--Al
If the amp is at fault, I'd suggest that you check the resistances of the power traces on the PC-3 board AFTER YOU UNPLUG THE AMP AND MAKE SURE THE HIGH VOLTAGE IS FULLY DISCHARGED. They should read close to the residual resistance of the meter leads, but I've seen some read about 60 ohms and guess what! They made crackling noises. If this is your problem, try reflowing solder over the traces AFTER YOU UNPLUG THE AMP AND MAKE SURE THE HIGH VOLTAGE IS FULLY DISCHARGED. Check for solder bridges before powering it back up.
Good luck.
--Al