Hello Markus, I've rolled many but not the KT90s, ie KT88 Gold Lions reissue - very good overall, Tesla NOS KT88 (NOT new production JJ Tesla)- excellent overall but tubes are hard to find, 6550s SED - good, Tungsol 5881 NOS - a great tube but lacks bottom end in this amp, Sylvania 5932 NOS - excellent all around - my personal favorite - good tight bass - excels in all other areas.
A great amp. I was using them on my rear and center channel but they deserve better so I,ve put them up for sale. Don't forget about the imput and driver stage for rolling. Enjoy. Bill
A great amp. I was using them on my rear and center channel but they deserve better so I,ve put them up for sale. Don't forget about the imput and driver stage for rolling. Enjoy. Bill