Interesting change in what little "hum" I have left after Raven upgraded the grounding loop system. I just I'm OCD about a totally black background. I rearranged my room where now I sit 3 feet further back from speakers. For some reason I'm now out of reach of a low frequency "hum" that I can reacquire audibly if I lean forward those 3 feet! In the meantime the soundstage and detail etc. are all still excellent. Weird but nicely so. My volume goes up a tad at this increased distance which also helps. (I have an off topic quick question...does anyone know the best DB's on the Lascalas where they produce their best sound? 70? 80? 90?)
Hum on Tube Amp - Can't find source
I have a hum (60hz) I can hear on my speakers and it happens with my tube monoblocks (either of them). With or without interconnects, it even happens on either amp (have tried one at a time) with every circuit on the house tripped/disconnected, every other component disconnected from the wall (including the Internet/CaTV line) and no interconnects.
One amp has it as soon as it warms up whereas the other one is intermittent.
Hum X doesn't solve it, iFi Ground defender either, AVA HumDinger on powerline doesn't solve it either.
I have replaced the tubes and both amps were just tested at the factory. Replaced the circuit breaker, tightened every wire on the breaker box, checked and cleaned all connections to ground rod. Added a hum eliminator to the internet line.
Hum cycles a bit with the tube glow matching the cycles.
I'm waiting on the power company to come check the power coming to the house.
Thoughts?