crackling sound out of right speaker

I'm going to try moving some power cables that may be causing RFI/EMI and see what happens.

Also, try turning off any dimmer switches, fluorescent lights, or compact fluorescent lights that may be in the vicinity of the cable to the right speaker.

Lew -- thanks for mentioning about the medical meaning of "zebra." Hadn't known that previously.

Regards,
-- Al

I had something similar to your problem. I had 2 Dale Resistors replaced in the preamp. 5.00 for parts. 125.00 bench fee, 87.00 shipping. When I heard the static it could only be heard a low or no volume. The music was able to hide it. Hope this helps, best of luck.

Are you using jumper cables betwenn posts? If so, be sure the jumper's posts are tightly screwed down.

I had a very similar experience where i was getting a crackling/interference/whistley sort of noise on the left side and it was driving me bonkers. After all of the cable switching I read about this phenomena called Tube microphony. Since I have a tube preamp, I found that that the tubes for the left side were the culprit. I hope all goes well with your diagnosis because I know you won't stop til you have this thing sorted out. Keep us all posted.

Polk and Vinylmad, The OP's problem has to be in his Right speaker or the cable leading to it. That's been settled, I think. Good thought by Miner to check any jumper cable that is being used to connect among terminals at the rear of that speaker. A loose connection could conceivably be a factor, either inside the speaker cabinet or at the speaker inputs.