I purchased a quad of Valve Art KT66 tubes and installed them into my VTA ST70 today. I have been running Gold Lion KT66 tubes which I like very much. I wanted to compare to the Chinese tubes. I switched off my amp after an hour of playing the stereo and I noticed that the power transformer was HOT. I biased them at .45mA. The Gold Lion tubes never loaded the transformer that much. The transformer was just warm to the touch before with the Gold Lion tubes.
I did notice that when I switched off power that the filaments took 15-20 seconds to loose all of their glow. The manufacturer must have used some heavy tungsten.
Has anyone any experience with these tubes? I am not sure if this is normal for these tubes or if I got a bum set. I do not plan to use them again and risk burning up my power transformer.
Thanks in advance.