Should I upgrade from Sylvania 6DJ8 to better tube


I currently use Sylvania 6DJ8 for my Conrad Johnson 17LS. I wonder if I can get much better sound with Amperex or Mullard. Or if it's just marginally better than perhaps I should spend my money on something else.
andy2
You may get different sound. If you want more detail or a "warmer" sound you can switch. 6DJ8's aren't cheap but run for many many years. They have a great impact on the sound and can be fun to roll. I'd go for Mullards...
Each brand will 'tailor' the sound somewhat.
Amperex is a nice overall tube, but there are those made in Holland, USA, Japan,etc; they will all have their own characteristics...which makes tube rolling fun.
Some tubes will give a warmer sound, some leaner.

Don't forget the 7308 tubes, which usually provide better highs but not quite as strong bass compared to 6DJ8/6922 tubes.
If you search around you can still find good deals.