The AI 3A will work very well with either tube or solid state amps. No guess work here--I've used it with both. I personally prefer tubes, so that's what I'm using now. Before I went all tube, I used the 3A with a very good solid state amp. I had no problems--the single ended triode tubes I'm using now are just better (IMO). If you want to stay with tubes--but improve reliability I would recommend Quicksilver amps. There are almost always some for sale here on A'gon. In my experience they are quite easy on tubes.
