Tube amps and speaker ohms

True i did swap the KT90's for th eKT88's w/o biasing. But also had a KT88 NEW intergrated for demo purposes. The amp did not perform on 88 db speakers. Divad may have better luck with his KT88. Both are chinese. Though cayin is chinese I consider that line on european standards. Ming da, and Melody are alos of european standards. The one Didad is refering to is not.

Tvad

The Tyler Signature Systems (1 Piece) have a nominal 4 ohm impedence and a minimal impedence of 3.5 ohms. I have driven mine with 160 wt amps w/6550s off an 8 ohm tap, 80 watt with KT88's off an 8 ohm tap, the PrimaLuna Five a 40wt amp with KT88's off the 4ohm tap (and 6550's as well), and my present Cayin a 70 watt amp w/KT88's off the 4ohm tap. The KT88's I was using are SED's. Power wise they all worked fine, the differences were in tone. I also used a 100wt high(ish) current ss amp and it in no way improved on the tube amps.

But, I also used another brand of KT88 in each of those amps and the sound of this KT88 was rolled off/enimic on both extremes and flat in the midrange. Very boring. I would have much preferred some of my 6550's, maybe even some of my old EI KT90's, if that was the only KT88 available to me. If I had speakers with no bass and a bright highs that particular tube might just be the tube needed.

I doubt that BF's experience has anything to do with Tylers Linbrook speakers impedence curve.

FWIW.

Divad, I am running a Tube Audio Design-60 with Vandersteen 2CE sigs (86DB I think. This amp runs 60 watts ultra and can be switched on the fly to triode (30 watts). This amp has plenty of juice for the vandys. I listen mostly to classic rock at room filling but, not loud levels and the vandys really sing. See Larryx7s post above. The TAD-60 can handle many EL-34 type tubes and is easy to bias. Check out the reviews on this amp. I haven't heard many other tube amps to compare but, I bet that it competes very well with amps in its $1300 class...

Eagleman