I just recently acquired a new amp that is so quiet I'm obsessing a little about noise. At the moment the only 9V adapter I have is a Roland ACR-120, and if I plug it into my Tone Press I get a hum; on battery the pedal is dead quiet. I also have a Hardware RV-7 that is dead quiet until I plug in the adapter, and then I get a hiss but no hum.
What are the options for a really quiet power supply?
If it matters, the amp uses a 54/55 Bassman circuit.