KT88 recom. for quicksilver mini mono's


I recently aquired a set of mini's and am looking for sugestions on tubes. Of what I have tried so far I have found I like the sovtek 6L6's. Upscale recommended the EHkt88 for a clean,dry, less warm sound, since I think that is the direction I am going in. What would you guys recommend that you have tried, what would you not recommend? Thanks, Matt
toomuchstuff

Showing 9 responses by jax2

I liked the JJ Tesla's over the Svet C's in those amps. Sorry to have to add yet one more option to your responses here. It's been too long to know my reasons, but I do remember that preference.

Shoot Mike Sanders an email - it may take a day or two, but he'll surely respond - or try giving him a call. All his contact information is on his website.

I'd definitely look into the Genelex tubes Albert is suggesting too.

Marco
11-30-06: Ndeslions
Warrenh : i don't think KR ever made a KT88.

I believe they did. It was made in the Tesla factory.

Marco
Jax2 : putting the KR brand on a Tesla tube is not what i call making a tube.
KR rebranded some KT88 but never did one.

Ah, well forgive me for not telepathically being able to interpret your personal standards. As I understood it, Riccardo Kron contracted with the Tesla factory to build his design. He was unhappy with the work they did and ceased production.

From the 6moons Interview of Kron:

You specialize in triodes though the KR KT-88 you produce is technically a tetrode. Explain this focus and why you're not interested in pentodes.

As an old-timer with tubes, I'm interested in all tube technology. However, pentodes cannot be successfully manufactured using our process. We were cooperating with another line production facility here in Prague, to build the KR KT-88. But our high QC standards could not be sustained by Tesla. The quality we received for our design was unacceptably low, unworthy of the KR brand name and trademark. With great disappointment, we had to suspend our work with the Tesla people.
Jax2 : well with your personal standard i could take a pen and write "Genelex" on any KT88.
The fact is that there's very few chances that those tubes will sound like a Genelex :)

Where did you see me comparing the sound of KR to Genelex? Re-branding has been a common practice throughout the history of vacuum tube making. Re-branding absolutely does NOT indicate an inferior tube, in fact there are many outstanding tubes available that are re-branded, though I don't think any were done with a pen. In this case, as I pointed out if you read the quote, Tesla was supposedly building a tube of Kron's design, and not their own as you suggested. I made no assertion whatsoever as to their quality.

Marco
FWIW, Vacuum Tube Valley (VTV) magazine did a 6550/KT88 shootout many years ago. I used to have a copy, but I think it made it to the recycle bin. The top three in that review were the Genelex 88's on top, TungSol 6550's second, and JJ/Tesla 88's third. No recollections of what amps they used (this would certainly make a difference), but I think there were a few, and judging was done by four or five panelists as I recall. Perhaps someone has a copy and can give more complete results.

Marco

The quote from the 6moons inverview with Kron is on page two of that interview here.
No, you are absolutely right Newbee. I was confusing the 6L6 with 6550's. My bad, and thanks for pointing that out. Strike my comments on the 6550's and give me a good swift boot in the ass. It sucks getting old. I don't think I ever tried the EL34's in the Baron because I was steered to the 6L6's from my complaints about the KT88's. I got mine as a Tri-tube.

Marco
Thanks Grant. I agree, it will depend upon the amp you are using them in. I've had similar experiences where one tube type sounds better than another in one component, but is bested by the one it beat when rolled in another component. Never had any draw me to the few Chinese tubes I've heard, but still, that doesn't surprise me in the least...I've always seemed to find the ones I've heard rather hard and edgy. The best thing to do, if you can afford the price and the time, is to get various sets of tubes (preferably ones that have been previously burned-in) and roll them in the equipment you are going to be using them in. Pretty much like everything else in this hobby: use your own two ears, your own system, your own room, your own music, and your own judgement. What someone else thinks is best, may not be what works for you, and you'll never know unless you try. Ask any question as to which ________ is best here in these forums...virtually anything....and you are bound to get a virtual rainbow of responses. Do a search if you want an example...best tube, best monitor, best CD player under...blah, blah, blah. Or just look at the responses to this query. There is no one right answer, and anyone who believes they think they know there is one single answer for such a question that applies to all individuals has their head deeply entrenched in their own rectal cavity...IMNSHO People and their preferences are as unique as their fingerprints. Threads like this, and others like it, are merely a good place to start.

Marco
I only rolled KT88's in the Mini-Monos. I was quite happy with the performance of them so did not try the warmer, more tubey 6550 approach (at least that's how I'd guess they'd sound). Perhaps I was missing out, but I really liked those amps with the KT88's in them. As I said, I ended up with JJ's. Clean and punchy and versatile, those amps mated well with many speakers. What did you end up preferring, Elsneb?
Did you have something specific in mind?

Yes, my experience rolling one type against the other was in a Mesa Baron (tri-tube) amp. There I found the KT88's to be a bit too hard and clean for my tastes, giving the Baron an almost SS sond to it. I longed for something a bit more warm in comparison. At the suggestion of a few folks (Jon at the Tube Store, and the tech guy at Mesa among them), I tried 6550's instead...I think they were Svets, but it's been a while...maybe in a previous post of mine...anyway, sure enough, in that amp and system, and to my ears, the 6550's sounded warmer and had a wonderful midrange, with a bit of sacrafice to the bass. On that amp the bass compromise was no problem as it is a prodigious performer there. The tubes were Svet's in both cases as I recall. This is over five years ago I think, so details are open to correction, but the overall impression is quite accurate, I'm sure.

Marco