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JADIS JA80 with 6550 or KT 88 or KT90 ?

My Jadis JA80 was built in April 1999 and came equiped from the factory with eight 6550 valves.

Before deciding to buy a new set of tubes, I would like to know some opinions about the advantage or inconvenience of using the KT 88 or the KT 90 tubes in my JA80.

Is there any experience of using these tubes (KT 88 or KT 90) in an amplifier designed from the factory to work with 6550 tubes?

Many thanks for your cooperation.
rato456
rato456 OP
3 posts
 
Many Thanks for your advise Mang53.

After some more opinions I hope to receive, I will come back to you.

Regards

rato456
loki1957's avatar
loki1957
122 posts
 
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.
khrys
446 posts
 
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.
szutinglee
91 posts
 
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
rato456 OP
3 posts
 
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
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