ARC D-115: What tubes and cables?


Hello all, I am seeking input on which tubes and cables will help in providing neutrality and extension in the highs for this amp. The tube complement is SED 6550 with 50% life in them and brand new Gold Lion and Sylvania NOS for the driver tubes. My dealer suggests KT88s slhould be next.
Any input would be appreciated!
128x128wahwah
Wahwah ,Yes Purist wires would be a giant leap ahead.
Magnan worked well at a more reasonable cost
Without knowing your complete system its difficult to suggest what should work for you but I would upgrade the Radio Shack wires before replacing the tubes
Yes!-Sorry for not being specific on the issue- The RS wires was one of those things that simply clicked with my system, and I was really surprised by this. And NO,they do not work well with the D-115. (It is a Mk 2 Hifi Geek).
Here is my System:
Modded Sony DVP 7000
Berning TF-10
Audio Research D-115 Mk2
Proac Studio 200
Audio Magic Xcallibur interconnects/cables.

One interesting development: Last night in frustration I angled the speakers INWARDS quite a bit from the usual position and Imaging improved nicely! However, they still do not dissapear as when I was using the D-120 with the Rat Shack solid cores.