Minimal use is actually a bad thing for capacitors. Those units also have a regulated filament supply and its possible one of the transistors or the IC has gotten noisy. That would show up in both the phono stage and the high level stage but might be worse in phono as the noise would be additive. You could try swapping tubes to make sure it's not a tube. Remember when you use the phono stage you are also using the high level stage as well.
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.