Replacing 6550s with KT 88s

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

Let me start by saying that the SED =C= are very good tubes and were most likely the ones used by c-j to voice your LP 70S.

c-j is currently using the New Sensor Tung-Sol KT120 in their current production amps and the LP 70S should be able to accommodate the higher heater rating. The owners at c-j think very highly of this tube as do most c-j users.

The New Sensor Gold Lion KT88 also comes from the Saratov, Russia factory and is, in my opinion, an excellent choice. I do not find it to be "tubey" sounding although there is an area in the upper midrange/lower treble where I think that 6550-based tubes excel and you may prefer them for that reason.

I do an audio web log for fun and you might want to read some further thoughts on this subject here:

http://jda1951.xanga.com/764150002/new-sensor-gold-lion-kt88/

I've listened to all of these tubes in both a c-j Premier 11A and Premier 140.

Hope this helps a little and good luck in your pursuit.