Hey Everybody,
Now that my review on Elfberht's has been posted I want to share some information on my experience with amplifiers driving them, along with the DI/DI SE's.
1) My favorite combo (s) on the DI/DI SE's are the LTA Micro-ZOTL / Triode Lab SET 2A3, retails for $3,900.00 and LTA Micro-ZOTL/ AricAudio SET KT-88, retails for $2,100.00. The 2A3 amplifier gives you a touch, and I do mean just a touch, more warmth and "meat on the bones" in the mid-range then the SET KT-88, which still has just a beautiful tonality in this very important frequency range, but Aric's SET KT-88 bests it in overall macro-dynamics and bass extension/control. If you only listen to acoustic music you will be thrilled with the 2A3 amplifier; however, if you listen to all kinds of music (rock, blues, heavy metal, big music pieces) along with acoustic jazz then I would recommend the SET KT-88 amplifier.
2) When I took the ZOTL/2A3 combo to power the Ulf's I still loved the tonality/colors, and image density. However there was a problem with the spatial dimensions regarding that the music seemed to be coming from just in front of speakers and lacking depth/width. The Ulf's did not do the magical disappearing act like its smaller siblings easily do. However, when I put the AricAudio SET KT-88 amplifier in the system I still got the great purity of tonality, 3D imaging of a SET design and then these big son of a gun speakers vanished in to a giant realistic layered sound-stage like a small reference level two way monitor does!
3) The only other SET amplifier that I auditioned that produced about the same level of performance across the board as Aric's SET KT-88 was a pair of SET 300b mono-blocks that retail for $9,000.00. To tube this amplifier "the right way" to get to this level of performance with NOS tubes, which I have in my own personal collection, would about another $1,500.00 for the pair. In Aric's amplifier to get great performance a pair of NOS RCA black plate triple mica 5751's, along with a pair of JJ Blue glass KT-88's comes out to about $200.00.
AS I stated on this thread already we have another Aric who goes on my short list of creative designers building high quality, great performing gear at such reasonable prices.