JADIS JA80 with 6550 or KT 88 or KT90 ?

you may want to try some EL34s' as well. I use EL 34s' in my JA 30s' and Ja 200s'. I haven't tried any KT88 or 90s' but I really don't like the set of 6550s I have for the JA200s. The 6550s have a hard edge to them.
Good luck.

Definitely KT88s. 6550s: Edgy, dynamic, analyical. EL34s: Lush, loose, soft. The KT88 blends the best of the 6550 and EL34: liquid midrange with enough low-end punch to match the high-end air. In short the best balance. The KT90 does not work well in Jadis products except the JA-100 and Orchestra Reference which have proprietary output transformers specifically wound for the KT90. My reference JA-100s sound like the perfect transistor; very hard to beat. But for some reason I'm looking for a pair of JA-80s and some Gold Lions.

my jadis ja30 came with ei kt90 tubes and i haven't felt the need to change. i also haven't heard the ja30 with power tubes other than kt90, so i am kind of speaking blindly. i did change stock 12au7 and 12ax7 to nos tubes with great results.
good luck!
scottie

Thanks to all of you for your contribution.

This is to let you know that I have purchased the SVETLANA KT 88 and I that the sound of my Jadis JA80 improved a lot.
These valves are much better than the 6550 or the KT90.
Sound became much more airy and halographic; extremes much more natural , without loosing detailed.
I can assure that this was one of my best investments to improve my sound.

Regards specially to Khrys

Joao

The kt88 definatly my favorarate is the 6ca7 for musicalty and close second is the 88 none of the midrange glare the 6650 or KT90 has, the 88 is just more full bodied much more texture smoother highs and more natural, have had several pairs of JA80S also have JA200S JA500S JA50 AND 100s I like the 80s and 200s the best.