I have not heard them but I understand they spec out at 300V/2W. A 6DJ8/ECC88 specs at 130V/1.8W, a 6922/E88CC at 220V/1.8W, and a 7308/E188CC at 250V/2W. So I guess you can run them hot in AI and ARC stuff. My EH EL34s sound good, but I am a tube newbie, so YMMV.
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