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Just about anything can be going on. I assume you have alot of confidence in the repair facility. Have you contacted them for some guidance and or suggestions? I would do one of two things. Work my way backwards removing a component and testing to see if the hum or hissing has gone away. Or unhook everything then add an item one at a time. This is in no particular order, so..... I remember from your previous post you were trying to bi- amp some speakers and at the end you had everything "singing". So things worked then. Something has changed from then to now, is anything new? 1. I would plug the bluos into the CD input and then test. 2. Next I would remove the sub from the bluos then test. 3. I assume the same speakers. What make and model? 4. Was the new non inverting amp tested before and worked fine so we can rule it out for now? Still bi-amping? 5. Tubes were replaced. Who sourced the tubes? What were they? Matched sets and tested? Line board and or phono board tubes? 6. Any other parts replaced on the preamp 7. Any new cables? Just look at one thing at a time and something will pop up.

My question is why would you swap an inverting with a non-inverting? That could be the cause of your hum/hiss as the polarity of the output signal is inverted.

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