crackling sound out of right speaker

Both the Rogue and your SF amp are very good. Its probably just a matter of personal taste on which one you will like better. If the crackling is a problem with you amp and you verified that you don't have bad tubes, the problem might be something very simple like an RCA connector or a tube socket. If it were me, I would have someone look at it before I did anything.

Dear Maddog, What evidence leads you to believe that the problem has something to do with your amplifier? Thanks.

Lewn; I've done the following:
Changed speaker cables (tried different cables)
Switched Left and right speaker cables (the crackling moves from right to left)
Moved interconnects (right to left and vice versa)
Tried a different amp which didn't produce a crackling sound.
Replaced input tubes in preamp and amp.
Although I did notice that the crackling did become less after changing input tubes in the amp.

"Changed speaker cables (tried different cables)"
Result?...

"Switched Left and right speaker cables (the crackling moves from right to left)"
[Lew]Do you mean to say that you attached the R side of the amplifier to the L speaker and vice versa?...

"Moved interconnects (right to left and vice versa)" [Lew] Do you mean to say that the L side of the preamp was then driving the R amplifier? Result?...

"Tried a different amp which didn't produce a crackling sound."
[Lew] you do realize that some of these results, most notably the effect of swapping R to L and L to R amp/speaker combos, assuming you swapped one end of the speaker cables, are different from your original post that started this thread, and different from some of your additional posts that were in response to questions. However, if the latest info is valid, you may indeed have a problem in one channel of your amplifier. Did you ever try swapping the amplifier output tubes from one side of the amp to the other? If that didn't move the problem from one channel to the other, then you probably have a bad solder joint or a failing tube socket or some such thing.

This sounds like an eminently fixable problem that should not require the purchase of a new amplifier, but I realize that competent technical assistance is not readily available in most parts of the US these days. This is the world of "if it's broken, throw it away".

Have you swapped interconnect cables to preamp/source.