Genelex Gold Lion KT-88 reissued tubes

Don, go here:

http://www.jacmusic.com/

and click on tubes > kt88, for a very interesting history and survey of all kt88 tubes, new and old. Neil
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Thank you Neil, very helpful info!

Don, my new McIntosh MC 275 Mk IV came with Russian Svetlana "S" KT88's (branded 'McIntosh', but that's what they are) and they sound wonderful, 'course I haven't heard anything else (yet) but I've no complaints. Mac also uses Electro Harmonix KT88's I understand. Those two along with JJ's tubes (the former Tesla) seem to be the most popular and reliable.

I just recieved my MFA 200D's back from modification by designer/friend Scott Frankland and after trying all the standards he decided on the reissue Gold Lions...the amps use 6 per side and put out 120 watts in Triode.
It is hard for me to just judge the tubes as they are one of several changes made to the amps, but Scott, who obviously knows his amps, went through a step by step process to optimize the amps and these are the tubes he chose.The amps have met and exceeded all of my expectations...very good to great with the changes.
I have used the originals (still have 4 NOS)in a very different design (audiopax) and find similarities in the fullness and richness of the sound...not euphonic or slow sounding.

From what I'm reading the KT88's add a little more warmth to the sound in comparison to the 6550 tubes. I have Tung-Sol 6550 reissues in my ARC VT-130 and would like to add a degree of warmth and richness to the sound.