Electro Harmonix KT-88 or 6550.
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i'm running ei kt90 type iii in my monoblocks. there are 8 tubes per amp and the bias setting is for all tubes so it is so low that i've never run into the glowing plate issue. that's not to say that the kt90's aren't problematic, but even if the plates in all 16 of my tubes of misaligned, they still sound significantly better than the electro-harmonix kt88's they replaced.
Thanks for your suggestions, isnt the factory tube in the quicksilver V4 pronounced Shuguang as well. Is this penta one also a chinese tube, and if so would it most likely be superior than the stock (shuguang-I think) KT-88 in the quickies. Where can I find this penta shuguang closed plate KT-88 SC, and I wonder how it would compare to say the KT-90. I know the KT-90 is said to increase the power in the V4, but will they retain the lush and textured midrange of the KT-88.
Use KT90's and your midrange may suffer somewhat. The kt90 is a more alive sounding tube. If you like to go in that direction then the kt90;s are for you. I had good responce with Valve Art kt-90s. Valve art kt90's sound great in Hurricanes. Kt 90's (series 2,) sound best in VTL 300 (need a boost in highend dynamics) My rogue Zeus Electro Harmonix are best, ect.I woulnt be too concerned with power output.
Ive found out of all these listed amps i sold them all and kept a rogue Magnum 120's, MUCH faster and less tubbey then the lot. Hope this Helps.