Peter, Wing C KT88 is good, 6550 Wing C is good.
I use 6550 in my VTL's.
The 6550 Wing C is preferred by both Audio Research and CAT, I'm sure they tested before making the choice.
I use 6550 in my VTL's.
The 6550 Wing C is preferred by both Audio Research and CAT, I'm sure they tested before making the choice.