Little Dot III headphone amp
What sort of life can I expect from the valves in the LD III amp, please? My listening is usually 3 hours, most nights, at low-ish levels. I see one on fleabay, by a UK seller, slightly dearer than others direct from China - are import duties going to add to the cost of an imported one? Would it be suitable to drive Grado SR80s via Naim 72/140 amp? I will appreciate any responses.