I think a real hiss would possibly be an issue, probably tubes, but the thing is...some, not all people will describe noise floor as hiss. My SV has no hiss issues but it’s not dead quiet when both volumes are at 12:00 noon, where they stay. It is what it is and it has never been distracting, especially when playing with a band. Some amps are quieter than others. Here is what I know for a fact...my SV is my go to number one amp that can never leave my possession.