Replacing 6550s with KT 88s

Mr P- Kevin Deal(Upscale Audio) sells both of those tubes. His testing, matching and burn-in procedures are second to none. The last set of Winged 'C's, that I purchased from him, lasted me over four years(at hard labor). I've since gone back to the(NOS) GE 6550A(at over five times the cost). I'm hoping that when that supply runs out, the Winged 'C' will still be in production. BTW: I wouldn't call the Genelex, "mushy." Just somewhat warmer than natural. Some systems are a bit threadbare, and can use the added color. Enjoy your music! (http://www.upscaleaudio.com/KT88/)

if you go to KT88 try the Shuguang Black Treasure CV181s. They are a notch up musically from the GL KT88s which themselves are very good

Anyone have any thoughts on the Penta Labs KT-88SC tubes as a replacement to the 6550?

Just so everyone knows, the Winged C factory burned down. At least that's what I was told. ARC now uses 6550WE

Rodman9999
I am curious about what changes you found using the NOS GE 6550s as compared to the Winged C 6550s. It may be possible to get a quad NOS from Singapore.Incidentally what power amp are you using?
Many thanks
Pradeep