PrimaLuna dialogue hp

What your speaker that not match with ?

I have 20 year old Atma-Sphere amps. While not quite as good as the current model they are nearly there. Tube technology has not changed all that much so if it's a well build component you should be fine. It is worth having it serviced early on though to ensure all the tubes are to spec and they no other electronic parts need to be serviced. 

the HP amp should be fine. Before you buy would suggest having a look inside (or have seller snap a few photos and send to you) and make sure the amp has the green fuse holders mounted on the chassis inside. The earliest versions did not have these fuses and relied only on the relay to open if a tube shorts.  If a tube has a short, over time it will take out the relay on the bias board, and you'll have to replace the whole bias board.