To Lapierre: Thanks! Actually the tubes are for the Jolida cd player. I am currently using 1960 vintage Mullard 12ax7 grey short plates (blackburn plant), they are my goto tube for most of the music. But I do have some Svetlana 12ax7 about the same vintage that I do prefer on some jazz stuff I listen to.
As far as homework - some, but really more trial and error buying and selling a lot of equipment before finding a combo I was really happy with.

