crackling sound out of right speaker

I brought the pre, amp and right speaker into the shop, the owner assured me it wasn't the speaker, he believes it's the input tubes in my amp, he loaned me a integrated amp and after hooking it up, the right speaker sounds fine. ill let everyone know what the actual culprit is as soon as I can.
thanks for all your suggestions

The owner assured me it wasn't the speaker, he believes it's the input tubes in my amp, he loaned me a integrated amp and after hooking it up, the right speaker sounds fine.

That seems irreconcilable with the fact that switching the L & R connections at the amp outputs did not cause the problem to move to the left speaker. Did he offer any comments on that?

Regards,
-- Al

I did some more troubleshooting prior to bringing my equipment in and the issue moved to the left channel when I swapped left and right speaker cables, I guess we'll see what happens when I get my equipment back.

Blue Heaven must have a crack or poor termination somewhere. Opening shrink tubes may be necessary. Try to use different speaker cables or better use generic speaker wire just for the test.

"I did some more troubleshooting"... Does that mean you repeated the experiment of swapping the speaker cables? And got a different result from what you reported previously? The impression I had is that swapping the speaker cable terminations AT ONE END, such that the L speaker is now driven by the R amplifier channel and upstream components, and vice-versa for the R speaker, did not move the problem from the R speaker.

But when you say you "swapped speaker cables", that could also mean that you took the R cable and used it to connect the L amplifier to the L speaker, and vice-versa. If you did that, only the speaker cables are tested. Which is correct?