The electrons are revolting against being forced to work with the tubes.
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I would ask Rogue. Since it's not there when you put on the mute switch it's not in the amps. While it could be tubes, it also could be a capacitor or even a resistor which only exhibits this behavior when it gets to a certain temperature. I had a similar problem with my JP80 preamp a few years ago, it took forever to find the problem (was a resistor) because to get to the problem component we had to take off the bottom plate, and when we did that it cooled off the resistor and stopped the problem. A good technician should be able to find it, but Rogue is best equipped to do the trouble-shooting.
Depending on your listening habits, you could be well over 3000 hours on the pre-amp tubes since 2001. 10 hours per week for 6 years = 3120 hours of on time. 20 hours per week for 6 years is 6240 hours and 30 hours of on/listening time per week is 9360 hours over the course of 6 years.
Since the problem goes away when you place the pre-amp on mute, you know the issue is not in the amp. I think replacing the pre-amp tubes is the next logical step.
I have a Rogue Magnum 99 also. It’s suffering the same issues that you have But only on the left channel. I do not have an amplifier as I use amplified speakers. I live in the Colorado foothills. We get a lot of Lightning, even in the winter. (2nd only to Florida). Our grid system when struck by lightning, turns off for a split second and then immediately back on. Guessing that’s not good for sensitive electronics. I sent it to my local shop, who are quite good. They could not hear popping. They charged me $60 for diagnostics, but could not even hear it. So I send it to Rogue and had it “Supered” while it was there as the repair cost is $250. ($600 for the upgrade which included the repair) ALL good! Fantastic!
I ran it for a week. And was awakened at 2 AM to very LOUD popping and no signal. (Oops-maybe lightning? see my other recent post on the same topic-LOUD popping on Rogue. (Thank you all again that offered advice). I had that repaired by my local Audio repair shop. It’s still suffers, again, from fizzing and tapping-sounds like Fred Astaire with canastas.
My repair person said he can’t fix it because he can’t hear it. I’ll bring in my Focal speakers, maybe that will make a difference at his shop.
BTW I really noticed the changes with the upgrade. Worth the $. It will probably have to go back to Rogue again. $200 shipping plus the repair. Ugh!