Someone give me the quick and dirty on the sonic differences between: EL 34, 6550, KT-88/90. My current mono blocks are stocked with el-34's heard thru Maggie 3.6. Thanks
Down and dirty-34s are sweet thru the mids,top/bottom a little weak.6550-muscular but lacking in top-end delicacy.88s are my FAV-fairly full range-good performer all around.No experience with the 90s.
Vacuum Tube Valley did a comparison of KT-88 tubes a while back. The JJ Tesla KT88 was the second best rated KT88 behind the venerated Genelex Gold Lion KT88. I use VAC factory Chinese tubes in my PHI 110/110 amp, and they are excellent.
90s sound more like heavy duty EL34s than KT88s, even though kt90s are a drop in replacement for KT88s. The kt90 is also going to output more power in most cases than a kt88 at the same bias. I think the bass on the kt90 is much better, but that is subjective. It is definitely a leaner and more SS sounding tube than a kt88. but to me the kt88 sounds tubby. take that how you will.
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