Receivers aren’t exactly known for being audiophile level cleanness of signal, no matter what the brand. What’s your amp @merlin66? Your systems components, as good as they are in their lane, just arent inherently clean enough to show the difference, as there are many users with much more $$/cleaner-signaled systems that are very happy with this product..
You’re probably audio and video in one system, and video is another big source of noise for clean and quiet hifi. Try separating a pathway for stereo music listening only with a good quality, quiet 2ch preamp (tubed if your so inclined) with HT bypass function and a separate stereo amp for front L & R... But the Puritan 156 is fitting into 50k+ systems.
You’re probably audio and video in one system, and video is another big source of noise for clean and quiet hifi. Try separating a pathway for stereo music listening only with a good quality, quiet 2ch preamp (tubed if your so inclined) with HT bypass function and a separate stereo amp for front L & R... But the Puritan 156 is fitting into 50k+ systems.