ARC LS2B upgrades? any suggestions?

I have an LS 2 b
It is a little bright in my system

I have tamed it with a dutch tube a little
but will probably upgrade to an ls5
I have it matched with a D200 solid state amp

Tom

Two ways to do it. The cheap way is to change the tube to a good NOS tube. I've tested over 15 different NOS tubes in there, so far my favorite is the Mullard Master Series M10 6DJ8. But it is hard to find. I was lucky to find one. The Amperex 6DJ8 with orange label and a globe logo, white label 7308 are also on top of my list. (This is based on the LS2B MkII I have) The Amperex 6DJ8 orange label is the cheapest.

The other alternative is to upgrade to the LS2B Mk II. I would presume that this will cost over US $1,000. I would not recommend going this route. You can probably sell your LS2B and get an used LS2B Mk II for much cheaper.