JADIS JA80 with 6550 or KT 88 or KT90 ?

Paul, whenever you retube an amplifier, this happens.

Put the tubes back in, and let them run in for at least 25 hours. They'll open up. Trust me. It's called break in.

Now, I'm not the biggest fan of EH KT88 or 6550, and you may end up preferring the Ei KT90. But, whatever you use when you retube, even if they're Ei KT90, when you first power them up, they're going to be EXTREMELY constricted sounding, especially at the frequency extremes, and lacking in power big time.

Personally, I like the JJ tubes the best. But, interestingly enough, I have also arrived at the conclusion that the Chinese tubes being produced today are far better than anyone would expect. I would have never believed this if someone told me, but I've tried some small signal tubes recently that surpassed some extremely well regarded NOS varieties. But, even they needed a day or two to open up to the point where I was satisfied with them. For my money, I'm hoping I never have to buy another Russian tube.

The 90's sounded excellent in the first minute.
Sound EXACTLY the same as today.
What I want to know is, does the other Jadis amps that use the 88 have simulairty as the EH88? If so then I may want to ignore the Cayin A88 and other Jadis' that use the 88.
Seems that most all Jadis uses 88's now.
Can the DA30 accept KT90's?

Thinking about it now, I made the best decision in getting the 88's trying them in the JOR. The 88 is not the sound I'm looking for. Its too mellow and vague.
I love the details, sharpness projected by the 90's. No I think I'll hold off buying the Cayin A88.
I think my next amp will be the JA30. I was thinking cayin 500, but there again its a big fat tube and will not likely present the striking sharp image the 90's produce.
Yep I think the DA30 will serve just fine...headed over one more time to Jadis' home page take a look at her.
Paul

Just discovered why Jadis gives many photos of the same amp, shows each with different tubes. You get a choice of at laest 4 types of tubes. UNREAL!.
that seals the deal, I'm skipping the Cayin, going Jadis next amp.
Now has anyone compared the 30 vs the 60? also the DA50?
Anyone know some prices?

I have a DA30 and DA60. The DA60 is definitely worth the price of admission over a JOR, DA30, or DA50S.

The DA60 moves to some seriously larger transformers, which are the most important component of a tube amplifier. The trannies are what you should be paying for. On top of that, the DA60 is running twice as many tubes. Of course, it's painful when you retube, but the positives of all this are a surprisingly sweet, relaxed, and powerful sound at the volumes The Doctor (Mechans) and I listen - 95 dB at the listening chair. He says it's the only amp he's heard that produces such a natural and seductive sound, without going in to what he refers to as "tube blow" (when the lows get wooly). My Coincident Troubass subs run 10" Peerless woofers and require some current to do bass properly, no matter what a low power devotee claims. The DA60 is able to deliver the goods for these subs.

Still, again I'm going to say that when you put new tubes in an amp, they MUST run - in. I just don't believe the Ei KT90 sounded as good right out of the box as they do today because I have used these tubes, and still have a new quad I bought to replace in the JOR when I had it.

Your description of the EH KT88 being mellow and vague is what I also hear in that tube, as well as the EH6550. Believe me, a set of JJ E34L, KT77, or KT88 produce that lively, open sound, and is why I have all three. For what it's worth, I believe the JJ KT77 offers the best overall sound. The E34L having far and away the best mids, the KT88 having the bottom, and the KT77 having that powerful low end, with mids closer (though not quite close enough) to that of the E34L tubes.

You'll also realize significant improvement in a Jadis integrated by rolling the 12AX7 and 12AU7 tubes. I can't stress this enough.