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I bought these for an old Supro class A amplifier I own to use as an experiment. These things break up at the earliest hint of power. If you're looking for any clean headroom at all, these aren't the tubes for you. If you want vintage grit at any volume level, these are the real deal. I expected the lack of clean as it's what I was looking for with this amp. I got exactly what I hoped for. The flavor of the grit changes the more you drive them. Good stuff.
