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Let me first tell you that they are 1 inch taller than my Sovtek Kt88, this is no small valve, the total recommended max plate dissipation for the plate is 54 watts that is very good, a good friend of mine also ordered 10 off and as with all new valves he gets he gives them a heavy test, he told me he put 580v on the plate and wound them up to 150ma current draw for 15mins to see what would happen ,and said they the plates did`nt even get the slightest bit red. That sounds dam good to me.
Now for the sound, stunning thats all i can say, i`ve had Svets 6550 and Sovtek Kt88 their good but do`nt compare to these, i own a pair of B&W801 s2 Matrix a ***** of a speaker to drive well. My amp rig is 4 box affair, 2x amps 2x power supplies with 4 output valves per channel i always listen in triode The 6550`s and the kt88`s could just drive them properly, but the KT90`s were so much more powerful, and controlled that you thought that someone had doubled the amount of output valves.
Yet these valves are as sweet as any 6550 or kt88 that i`ve heard on my system. One other bonus is that they put out halve the heat of the 88 or 6550`s do`nt ask me why the heater current draw is the same and all other parameters are also the same, must be the size of the massive plate structure, get rid of the heat more efficiently.
Cheers George

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