Replacing 6550s with KT 88s

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

I can be a little more "frequency specific" in as much as I also use CJ amps, (Premier 12's) but I bi-amp my Apogee Duetta Signatures with them on the woofer panels...these handle low bass up to lower midrange and when I swapped out the SED Winged C 6550's with EH KT-88's the KT-88's did just what I had hoped: punchier, more extended and articulate bass control including a lower midrange that also stayed smooth and rich...I can't speak for the rest of the frequency range though so take my experience for what it's worth for you. Good luck