I suggest you do not make any changes anywhere in the chain at all until the new preamp is fully broken in, which is anywhere from 400-500 hours of playing time(not just powered, but playing). Unless you bought the unit used.
I hate to say it because you probably heard it before, but with cables, be it power cords or interconnects or speaker cables, it is very system/component/room/listener dependent. There are too many variables to consider. Very hard to make any specific recommendation. If you live in the US, it is best to take a set of different cables from Cable Co. They have a lending library with huge selection of cables. It's a lengthy process that can also become difficult and confusing to select the "right" combination of cables.
Another way to do it is to buy used cables here and sell them if they don't work out for you.
To start with something, start with what you have. Give your preamp time to break in and yourself time to adopt to new sound. No surprise that LS-26 sounds different from your last preamp. You need to get used to its sound. Let it fully cook and then see how you like it before you start swapping cables.
FWIW, I use Shunyata Taipan Helix Alpha on my ARC preamp. Shunyata Python VX on cd player and Audience powerChord on the amp. ICs are Acoustic Zen Silver Ref MkII from cd to pre and Matrix REF MkII from pre to amp.
I hate to say it because you probably heard it before, but with cables, be it power cords or interconnects or speaker cables, it is very system/component/room/listener dependent. There are too many variables to consider. Very hard to make any specific recommendation. If you live in the US, it is best to take a set of different cables from Cable Co. They have a lending library with huge selection of cables. It's a lengthy process that can also become difficult and confusing to select the "right" combination of cables.
Another way to do it is to buy used cables here and sell them if they don't work out for you.
To start with something, start with what you have. Give your preamp time to break in and yourself time to adopt to new sound. No surprise that LS-26 sounds different from your last preamp. You need to get used to its sound. Let it fully cook and then see how you like it before you start swapping cables.
FWIW, I use Shunyata Taipan Helix Alpha on my ARC preamp. Shunyata Python VX on cd player and Audience powerChord on the amp. ICs are Acoustic Zen Silver Ref MkII from cd to pre and Matrix REF MkII from pre to amp.