Thanks for the replies. Of course, it is possible that something is wrong. That cannot be really known until I retube.
One thing is for sure, it won't be with 6550. I'll get two quads of JJ Blue Glass E34L. Because of my impatience, I was thinking of trying my quad of JJ KT88 in one channel just to see. |
Bob, will you be coming over next Saturday??? Hopefully, the answer is yes.
I did try the Sovtek 6550s in the DA30 last night, and I must say that while the amp runs out of steam before its big brother, though still within the limits of being acceptable to all but the really power thirsty, it's simply a better component sonically. Even with these tubes, while not as glorious as the JJ KT88, the sound was commendable. Despite its homely looks, whatever purity was designed into it originally, later iterations seem to have lost to some degree. Not that the DA60 is not a very good amp, it is, just that the older amp is INCREDIBLY special. The sweetness, naturalness, and even excitement is wonderful. I guess, sometimes, the old stuff really is that good. |
Rob, I'm so happy about the JOR not having a "real" transformer issue. That would be quite painful.
You read me 100% correct in my saying "loose" meaing what you thought it meant. My idiotic ramblings are so all over the place, it's a wonder anyone can understand me sometimes. It's easy to see how a loose transformer could really buzz. The biasing of the amp should not involve loosening the transformers whatsoever, only reading a few resistors, and adjusting the respective potentiometers until the voltages on those resistors falls into spec. Still, I'm sure it could have loosened any number of ways.
Good luck with that JOR, it's one of the finest sounding amps I have ever encountered, if not the finest. |
Well, after spending a few more days trying certain things, and talking to a few people, I wanted to update things.
In my situation, the crux of the problem is NOT the Sovtek 6550. I wanted to clarify that I have been listening to them in my DA30, and while certainly no match for the JJ KT88, they still allow the Jadis sound to assert itself. I feel obligated to let everyone know that while they are not going to become my favorites, they are not the root cause of the poor sound I am experiencing.
I guess for many, sadly, they would not think anything was wrong with the DA60. However, I have become quite familiar with the Jadis magic, and this amp does not possess that. Amplifiers from other companies simply do not have it. Someone not familiar with it might not be able to tell, but I was. And, it is through no fault of the tubes. While a legitimate Jadis, I have discovered the amplifier has been modified by folks who have somehow bled what is special about a Jadis out of it. And, along the way, have done a lot of wrong to the amp, manifested in the way it works. This was in no way devulged to me by the seller, and the amp was listed in very good - excellent condition. I am not sure what my recourse is. But hey, caveat emptor, I bought a used component. Though I have purchased new Jadis products, as I said, there was no way I could swing $11,800 for this integrated. Worst case scenario is that I have found a person expert in Jadis, and has the ability to get the DA60 to where it should be. At which point, I can accurately determine how it compares to my JOR and DA30.
But, again, I feel it necessary to make sure I apologize to Sovtek in regards to their 6550 output tubes. They are NOWHERE as bad I initially inquired about,
Joe |
I have been in contact with both Pierre Gabriel - North American distributor, and Avi Brand - US service rep, along with the former owner in regards to the amplifier.
In Avi's estimation, he knew this particular amplifier, and the person who modified it. Without naming any names, he was pretty sure the amplifier had major problems ala the mods this gentleman normally performs. I had already found two of the fuses in adjacent tubes to be blown. I took it up to him on Long Island, and he found a considerable amount of things, apart from the mods wrong with it. In less than a week, he let me know it had been restored, and though I should change out the tubes for something better sounding, it was now something that he predicted would make me happy.
I'm more than a bit unhappy with the former owner selling me the amplifier as it was, considering the excellent condition, especially mechanically and sonically, he listed it in, told me over the phone, and also when we met to give me the amplifier. Not sure what my recourse with him is yet...
Yesterday, my daughter and I again drove up to Long Island, and picked up the amp. Avi and I spoke for a while, and he felt confident I would feel I now had a Jadis. Obviously, the horror stories in terms of astronomical waiting periods in Jadis repairs are nothing of an issue when it comes to Avi Brand. He even called late last night to find out how I liked the sound, and to make sure that everything was working properly. More than gets my recommendation for sure.
In listening last night, what a difference!!! Avi was right, it was again a Jadis. With those herculean transformers and 8 tubes per side, it should make some power, and it does. Far in excess of the DA30 and JOR, though in a very relaxed way. It plays as loud as desired, and never falls apart (interesting, in another thread, someone mentioned a Jadis DA60 integrated falling apart during the music - NOT!). It was VERY good sounding now.
As good as the amp sounded, I put my quad of JJ E34L in one channel, and with the balance to that channel, was able to A/B the sonics of the Sovtek 6550 and the JJs. NO COMPARISON. The JJ Blue Glass E34L tubes are simply night and day better sounding. The difference in power (in terms of loudness), as I have also seen in the DA30, was trivial, though the bigger tube's bass is better. Of course, the dynamics and life of listening to one channel is not very strong. Still, the improvement was more than obvious to my wife and I.
Sometime in the next day or two, I will hook the amp up with the Coincidents. Which are the speakers I bought the amp for in the first place. I've found no amp to be better for the Coincidents than my JOR and DA30, so hopefully, this will be the top of the mountain for us and a lifetime purchase.
So, the Sovtek 6550 is not a tube I recommend for anyone. Hard, edgy, irritable. It's just a bad sounding tube compared to what else is in the marketplace. In terms of 6550, the Electro Harmonix are far, far superior, as are the true Svetlana/SED KT88. My dilemna is whether to now retube the DA60 with JJ KT88 or E34L. The KT88 will do the bass better, these E34L seem to be, as in my JOR, potentially glorious in the midrange. Will have to think about it a while...
Lastly, I'd like to say that for anyone considering the purchase of a Jadis, you are FINALLY once again, in good hands. This week, Pierre has offered to upgrade the amplifier for me to current specifications, for the price of shipping only. He wants me to have all of the recent modifications, and a unit sounding as good as a DA60 possibly can. He'll even send me the box to ship the amplifier in. I would have saved the repair bill had we had been able to reach each other through the phone tag over the holidays, but still, you really have to take your hat off to Pierre. I feel that there is now tremendous incentive for audiophiles to return to the Jadis family. The sonics are so good that they will surprise many an audiophile who has become used to the what the rest of the companies have been selling them over the recent past, and the support from both Pierre and Avi is second to none. |
Jonah, the Ei KT90s had been standard issue with the Jadis products for a long time. I was speaking to Pierre Gabriel prior to HE2006, and he felt my assertion that a few notorious batches of mid - 1990s Teslovak (now JJ) KT88 was enough to have Jadis switch to the tremendously rugged Ei KT90 was probably accurate.
That being said, both of us are far more enamored with the sound of the JJ KT88, which Jadis is currently using.
Next to some of the 6550 variants, the KT90 is probably the most balanced tube from top to bottom, sonically. Bass extension is deep and taught, and the treble is nicely extended. However, the soul of music is in the midrange, and this tube lends a coldness to this area that really left me wanting in comparison to some of the other tubes I have tried.
In case you are wondering, I've now been blissfully enjoying the Jadis DA60 for several months now. Currently, the newly released JJ KT77 tubes are in the amplifier, as I like what they do overall. Powerful low frequencies, like the bigger tubes, along with better mids than the larger tubes offer. The most glorious sound comes from the JJ E34L, but the bass is pretty weak with this tube. Still, I'm going to be picking up another quad of the E34L (to make 8) very soon to tide me over when I want that incredible midrange.
Also, rolling the small (12AX7 and 12AU7) tubes is as meaningful as the output tubes. |
Maxxc, the "new" Jadis for me is actually a used amplifier, so it's already burned in. My experience is that Jadis amps take a good long time to burn in, but such is not the case this time. $11,800 is more than I could swing, as much as I'd love to buy from Pierre Gabriel - VERY good guy.
Albert, your Sovtek 6550 story makes me wonder why anyone would use this tube, beyond price. Well, maybe that's the reason? Anyway, again, after my past experiences being around ARC, CJ, and VTL amps, and living with this tube and the EH6550, as I have said many a time, I'm simply not a fan of the 6550. The JJ KT88 has sounded better to me in every application. Yes, it's more expensive, but the price is a pittance in comparison to the sonic benefit.
Justlisten, this is my third Jadis. I began with the JOR, which was sublime with JJ Blue Glass E34L. Best midrange I have yet to hear from any amplifier. Next is the DA30 that I still own. Also fantastic, but much different from the JOR. It's strength is a luscious midbass - lower midrange and an overall sweet tone. I could use a bit more power in some situations, which led me to the DA60. Neither was dark sounding. I was most happy with each of them.
So far, this DA60, built like a beast as you have said (1975 Arnold power transformer - the DA30 looks like girly man in comparison), seems lacking in excitement sonically. I now have Mullard Blackburns in the 12AX7 and 12AU7 positions, and while things are looking up, I could still use bit more of the jump factor. |
Bob, it's great hearing from you! I'd really love to hear your CAT once it returns home. Knowing you, I'm sure it sounds lovely in your system.
I spent a good amount of time listening last night, and interestingly enough, the faults Albert attributed to this tube are EXACTLY what I heard. The dynamics are weak, and the sound just seems to lack the get up and go I demand. The high frequency distortion was also there in spades. Most curious was that female vocals took on a peculiar "lip smacking" effect where there should have been breathiness. Imaging was not terrible, but not up to the standard set by the JOR.
I did try the quad of JJ KT88 in one channel, and that seemed to help out a fair amount, but I was still getting the Sovtek 6550 effect masking the overall sound, so I am not 100% certain if a retube will cure things.
I went back and forth with the DA30 a couple of times, and it had a snappier, more lively, and easier to listen presentation. It's really a superlative amplifier, apart from ultimate power and not being the last word in imaging. My DA30 is one of the first integrateds Jadis ever built. I have been told by two people that later iterations modified the circuitry to enhance thermal stability of the amps, which has NEVER been in an issue with mine, at the expense of sonics. May very well be true in my experience. What it lacks in cosmetics, it sure makes up in sound.
The one combination I should have tried in retrospect was the Sovtek 6550 in the DA30. That would perhaps answer a lot of questions.
Still, this is the amp for the second system, and I'm probably putting way too much effort into the whole thing... |
