I had a slight hum from my speakers (not transformers) when running a LM805ia SET amp that was effectively eliminated using an Equi=Core balanced transformer. The amp has hum pots so some hum is expected. However, with proper management it can be reduced to nearly null.
How much hum is normal from a new tube amp
I just bought a great sounding Lab12 Suara KT120 tube amp. The issue I am having is a hum that is coming from the transformers. I can hear it with no music playing faintly from my listening position 12 ft. away. The question is, should I return it, or is this normal acceptable.