Sounds like your line level tubes are going bad. My 2D is pretty quiet. Roger at Music Reference has some robust and quiet tubes for a reasonable cost.
Audible Illusions hiss
My AI Mod 3 has noticeable hiss in both channels. It does not get louder as the gain is increased and is not present when the mute button is on. It also does not matter which source is selected.
Someone said the tubes in these can make a big difference. Does anyone have any experience in this area? Thanks.
Someone said the tubes in these can make a big difference. Does anyone have any experience in this area? Thanks.